Circles Vocabulary
Diameter/Radius
Circumference of a Circle
Area of a Circle
Finding values when given Circumference
100

What is a round shaped figure that has no corners or edges?

Circle

100

When given the radius, how to do you find diamter?

Multiply by 2

100

The circumference is considered the ______of a circle.

Perimeter

100

The area is the number of square units ________ a circle.

inside
100

The circumference of a circle is 4ℼ cm. Find its diameter, in centimeters.

d=4cm

200

What is the number of square units inside of a circle?

Area

200

When given the diameter, how do you find the radius?

Divide by 2

200

What are the two formulas for circumference?

C=ℼd

and

C=2ℼr

200

What is the formula for the area of a circle?

A=ℼr2

200

The circumference of a circle is 24ℼ cm. Find its radius, in centimeters.

r=12cm

300

What is the distance around the circle and considered the perimeter of a circle?

Circumference

300

If the radius is 7, what is the diameter?

14

300

The diameter of a circle is 54in. What is the circumference? Express your answer in terms of ℼ.

C=54ℼ in

300

The radius of a circle is 9 in. Find its area in terms of ℼ.

A=81ℼ in2

300

The circumference of a circle is 9ℼ m. What is the diameter, in meter?

d=9

400

What is the line segment that goes from the center to any point on the circle?

Radius

400

If the diameter is 32, what is the radius?

16

400

The radius of a circle is 12yd. What is the circumference rounded to the nearest tenth?

C=75.4yd

400

The diameter of a circle is 21 cm. Find its area to the nearest tenth. 

A=346.4 cm2

400

If the radius of a circle is 32in. What is the circumference and area of the circle? Round each answer to the nearest tenth.

C=201.1in

and

A=3217.0in2

500

What is the line that runs across the entire circle passing through the center?

Diameter

500

If the diameter is 17.8, what is the radius?

8.9

500

Alison used wire fencing to form a border around a circular region in her backyard. If the radius of the circular region was 25 yards, what was the total length of the border, rounded to the nearest tenth of a yard?

C=157.1yards

500

Joseph created a circular play area for his daughter. The diameter of the circular region was 34 yards. If he wants to fill the play area with sand, about how much square yards of sand will he need? Round to the nearest hundredth of a yard.

A=907.92 yd2 of sand

500

DOUBLE JEOPARDY!

If the circumference of a circle is 32ℼ. What is the area of the circle? Round the answer to the nearest tenth.

A=804.2 m2


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