Vocabulary
Circumference
Irregular Shapes
Area
Finding Radius/Diameter
100

A straight line from the center to the circumference of a circle or sphere

Radius

100

What is the circumference of a circle if:

the radius = 7 yds? Use 3.14 for pi.

43.96 or 14π yds

100

When finding the area of a semi-circle, find the area of the whole circle then divide by _____.

2

100

What is the area of a circle if:

the Radius = 6 in.  Use 3.14 for pi.

36π or 113.04 in2

100

What is the diameter of a circle whose circumference is 314? Use 3.14 for pi.

100

200

Name the line in a circle that cuts it in half.

Diameter

200

What is the circumference of a circle if:

the radius = 9 yds? Use 3.14 for pi.


56.52 or 18π yds

200

When finding the area of a quarter-circle, find the area of the whole circle then divide by ___.

4

200

What is the area of a circle if:

the Radius = 3 ft.  Use 3.14 for pi.

9π or 28.26 ft2

200

What is the diameter of a circle whose circumference is 690? Use 3.14 for pi.

219.63

300

The outside measurement of a circle. Or the distance around the outside of the circle

Circumference

300

What is the circumference of a circle if:

the radius = 8.4 yds? Use 3.14 for pi.

52.75 or 16.8π yds

300

What is the area of a semi-circle with a radius of 2? Answer in terms of pi.

2pi

300

What is the area of a circle if:

the Diameter = 12 feet? Use 3.14 for pi.

36π or 113.04 ft2

300

St. Patrick's Day parade is the world's oldest parade and the largest in the United States. This happens where?

The New York City  

400

The measurement of the inside of a circle. Or how much the circle covers

Area

400

What is the circumference of a circle if:

the radius = 7.4 yds? Use 3.14 for pi.

46.47 or 14.8π yds

400

When finding the circumference of a semi-circle, you:

1. Find the circumference of the whole circle

2. Divide by 2.

3. What's step 3???

Add the diameter!

400

What is the area of a circle if:

the diameter = 8 in.  Use 3.14 for pi.

16π or 50.24 in2

400

What is the radius of a circle whose circumference is 901? Use 3.14 for pi.

143.40

500

Pi is the constant of proportionality that relates diameter to ________ .

Circumference! 

(NOT area!)

500

The circular fountain in front of the courthouse has a radius of 9.4 feet. What is the circumference of the fountain? Use 3.14 for pi.

What is 59 ft?

500

What's the circumference of a semi-circle whose diameter is 3? Answer in terms of pi

1.5*pi + 3

500

A dog is leashed to a point in the center of a large yard, so the area the dog is able to explore is circular. The leash is 20 feet long. What is the area of the region the dog can explore? Use 3.14 for pi.

1256

500

What is the radius of a circle whose circumference is 372? Use 3.14 for pi.

59.21

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