# Circles Homework 15-85

**No answers ... yet!**

How do you do this word problem?

Two circles have radii 6 cm and their centers are 6 cm apart. Find the area of the region common to both circles.

Mar 7 | Nick from Latrobe, PA | 0 Answers | 1 Vote

GeometryArea Of Sector And Arc LengthGeometry Word ProblemsCircles**No answers ... yet!**

Central Angles

The diameter of a circle is 120 meters. The circumference of the circle is 377 meters and the area is 11,309 m^2. Find the measure of a central angle in degrees and in radians.

Feb 26 | Delilah from Clermont, FL | 0 Answers | 0 Votes

GeometryCirclesGeometry Honors### Mark M.

Carson, CA

Measure of a central angle

A Ferris wheel has a diameter of 120 meters, a circumference of 377 meters and an area of 11,309 m^2. There are 30 cars equally spread around the Ferris wheel for people to sit or stand. Find the...

GeometryWord ProblemCircles### Arturo O.

Melbourne, FL

Circumference Using Diameter

What is the circumference of a circle, if the diameter is 120 m? What is the area? ( I am checking my answers from my homework to ensure that I got this one correct! :-) )&nb...

GeometryCirclesCircumference And Area Of CircleCircumference Math Equation### Kenneth S.

Mesa, AZ

If two circles intersect at two points, prove that their centres lie on the perpendicular bisector of the common chord.

This is question from NCERT book class 9. I want the solution before 18 hours. Because next day I have exam.

Feb 17 | Aaditya from Arvada, CO | 1 Answer | 0 Votes

Circles### Scott S.

Frederick, MD

Help pls! Thank you

Find the radius of the circle which circumscribes a square of side 10cm.

Feb 16 | Cheyenne from Schenectady, NY | 2 Answers | -1 Votes

RadiusCircles### Mark M.

Carson, CA

a circle has the equation x^2+y^2=50. Find the equation of the tangents to the circle that are parallel to x+y=8

I managed to do all the questions apart from this one, and have no idea how to even start it

Jan 21 | Amelie from New York, NY | 1 Answer | 0 Votes

GraphsCirclesCircle EquationsCircle GraphTangent Of Circle**No answers ... yet!**

In figure AB =AD=DC=PB and angle DBC =20. determine angle ABD AND APB.

In figure AB =AD=DC=PB and angle DBC =20. determine angle ABD AND APB.hence prove that Ap is parallel to Db. Please answer the questions

Jan 28 | Sushant from New York, NY | 0 Answers | 0 Votes

Circles**No answers ... yet!**

If r and R are the radii of smallest and largest circles which passes through (5, 6) and touches the circle (x-2)^2+y^2=4 , then value of r*R=p/q is then p+q is

The answer is 45.Please send the complete solution.

Dec 21 | Akarsh from Floral Park, NY | 0 Answers | 1 Vote

Circles### Kenneth S.

Mesa, AZ

May I ask about Tau and Pi ?

Teacher, I ever heard that Tau was the one true circle constant. Then 2Pi? Aren't they same ?

Dec 17 | Top from New York, NY | 1 Answer | 0 Votes

Circles### Mark M.

Carson, CA

Find the degree measure of the arc of a sector

Find the degree measure of the arc of a sector whose area is 18π square units given that the length of the radius is 12 units

Dec 14 | Erik from New York, NY | 1 Answer | 0 Votes

Area Of A SectorGeometryCircles### Andrew M.

Palm Bay, FL

The graph on the right shows a circle with its center. There are 40 stone blocks situated uniformly on the circle. The diameter of the circle is 27 meters.

a. What is the radius of the circle? b. What is the circumference? c. Since there are 40 stones located on the circumference, how far apart are the centers of the stones? The stones are all...

Dec 14 | Megan from Corona, CA | 1 Answer | 0 Votes

Circles### Kenneth S.

Mesa, AZ

If r and R are the radii of smallest and largest circles which passes through (5, 6) and touches the circle , then value of r*R=p/q is then p+q is _________?

The answer is 45.Please send the complete solution.

Dec 21 | Akarsh from Floral Park, NY | 1 Answer | -1 Votes

Circles### Don L.

Jacksonville, FL

what are the coordinates of the center and the length of the radius of the circle?

The equation of a circle is x^2+y^2-2x+6y+3=0. What are the coordinates of the center and the length of the radius of the circle.

RadiusCircleCirclesHelp Asap PleaseGeometry### Richard P.

Alexandria, VA

Find the standard form of the equation for the circle with the following properties. Endpoints of a diameter are (8,10) and (2,12)

help asap

Nov 5 | Anna from Smithville, TN | 1 Answer | 0 Votes

Circles**No answers ... yet!**

Circle and square distance relationship

I'm sure there is a formula... here is my reference http://conepatterns.com/Intersection.jpg I want to know how derive the answer for the distance from the center of the...

Nov 14 | Sean from Greenbrier, TN | 0 Answers | 0 Votes

Circles**No answers ... yet!**

Formula for circles and squares?

I'm sure there is a formula... here is my reference http://conepatterns.com/Intersection.jpg I want to know how derive the answer for the distance from the center of the...

Nov 14 | Sean from Greenbrier, TN | 0 Answers | 0 Votes

Circles### Mark M.

Carson, CA

Two concentric circles of radius 12cm and 13cm are drawn. The chord of the larger circle is tangent to the smaller circle. Find the length of the chord.

Draw an appropriate figure

Oct 2 | Gool from Sadieville, KY | 1 Answer | 0 Votes

CirclesGeometry### Arthur D.

Saugus, MA

Finding shaded area of circle

How do I find the area of the shaded area if the circle's radii are 15cm and 13cm and the angle of the triangle in it is 80? What formulas do I have to use? http://i...

7/24/2016 | Kyle from Beverly Hills, CA | 1 Answer | 0 Votes

Circles### Mark M.

Bayport, NY

find all points having an x-coordinate of 9 whose distance from the point (4, -4) is 13

There are no additional details

Sep 18 | Tara from Owings, MD | 1 Answer | 0 Votes

Circles**: Circle Basics, Circumference & Area, Area of Shaded Regions, & Tangent Lines;**

__Part 1____Arcs, Central Angles, Chords, Sector Area, Arc Length, and Segment Area). I know a majority of schools teach circles as one big unit but I don't think that most of my special education students could remember all of those theorems and rules and be successful. For those that teach circles as one big unit and your students are successful, can you show me a sample of your unit outline? :)__

**Part 2**:__We used the foldable below to learn about the basic parts of a circle. I LOVE this foldable and have used the same one for the past 3 years. Students choose one color to represent each vocabulary word and color-code accordingly. I found that this helps students out A LOT! I really emphasized the difference between a secant and a chord. Also, when listing chords, some students forget to write down the diameter down so I reminded students that the diameter is the longest chord in a circle. Identifying all the radii in the circle helped students realize that even though a line is not drawn, it is still a radius! After the notes on our foldable, I told students to close their foldable and attempt the blue sheet (vocabulary review) by themselves. I told them to read through the definition and draw a picture. About 85% matched the vocabulary word with the definition correctly with the most common mistakes of switching tangent and secant.__

**Day 1:**I had too much time left in class so I decided to start circumference and area notes. I labeled the purple sheet with the students before introducing the flip-book. On the purple sheet I had students write down d=2•r and r = 1/2•d (even though it is not shown in the pictures). We only went through the vocabulary, circumference, and area sections of their flip-book. These examples were easy and a quick review of what they already know about circumference and area. Overall, the vocabulary, circumference, and area section took about 15 minutes to complete (and most students finished the examples before I was even done!)

After the notes, I handed them the following homework to complete over circle basics. I did have to to remind students again that the diameter is a chord in problem #4.

** Day 2:** Students walked in and opened up to their circumference and area foldable. Before we got started, I cold called on several students and asked them questions over circumference and area. Some sample questions that I asked students were, "If the diameter of a circle is 10m, then what is the length of the radius?" "If the circumference of a circle is 56⫪, then what is the radius of the circle?" "If the area of a circle is 49⫪m², then what is the circumference of the circle?" After I had several students answer my questions, we started on the more circumference and more area sections in our flipbook. Many students got stuck/had questions on the square inscribed in the circle problem (on finding the diameter).

After the notes, I handed students the following circumference and area homework. Students had the most questions on the diameter on question #8 since we have not practiced 45-45-90 triangles in a minute :)

** Day 3: **Students walked in and cut out their area of shaded regions foldable and taped it down next to their review of area formula chart. I am so glad that I made this review of area formula chart to place next to their area of shaded regions foldable because many students referenced this when we got to the homework. In many of my classes, I have to tell students how to find the area in very clear and concise ways or I will lose/confuse many of them. For example, I told students that to find the area of the shaded region in example 4 we will use the following formula: "area of the big circle - area of medium circle - area of the small circle."

After the notes, I had students complete the following area of shaded regions homework. Again, most students had questions on how to find the diameter of the circle in question 4 (just like circumference & area) so in my lower level classes, we went over question #4 together.

**Day 4: **Today we did the following tangent lines foldable together as a class. We completed the foldable first and then summarized our findings on the blue graphic organizer. Students really understood the concept of tangent lines after this lesson. Question #3 was definitely my favorite question on this foldable :)

After the foldable, we completed the following worksheet over tangent lines and students did GREAT on this formative assessment. Most of my special education students could complete #5 correctly, even though there was not a question like this on our notes (big deal in my class).

**Here are some of the files that I used: **

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