Circle Circle Circle

Radius & Diameter

100

What is the radius of a circle with a diameter of 88?

r=44

200

What is the Diameter of a circle with the circumference of 7? to 2 decimal places 

d= 2.23

300

How do find the Diameter with only the radius is given?

multiply the radius by 2

400

c=678 what is the radius 

108

500

Mary wanted to buy a placemat but the circumference has to be 65 cm. What is the radius of the required placemat?

r= 10.3503185

Parts of a Circle

100

What is the name of a sector with 90 degrees? 

A Quadrant 

200

What is a straight line that touches but never crosses a circle? 

A Tangent 

300

Name the part of the circle that touches 2 points on the circumference but does not go through the origin 

A Chord

400

How many degrees is a semi circle? 

180 degrees 

500

Another name for Perimeter of a Circle - SPELLING counts 

Circumference 

Circumference

100

What is the circumference of a circle with a radius of 0.68?

4.3

200

How do find the circumference of a circle when you only have the diameter? 

 d x 3.14= C

300

The circumference of a circle is 29 and the radius is 7.  True or False 

False 

400

If the diameter of a circle is 5 what is the circumference?

15.7 

500

How do find the circumference if only the radius is given?

multiply the radius by 2 and 3.14 

r x 2 x 3.14

Area

100

What is the area formula for circle?

^{Pi times radius squared}

200

What is the area of a circle with a radius of 30 cm.

2826 cm²

300

The area of a circle with a 66cm diameter is ___. 

3,419.46 cm²

400

What is the area of the base of an 8cm cake pan?

50.24 cm²

500

DOUBLE JEOPARDY

What is the area of a circle with a circumference of 12.56yd?

Mixed

100

The school is putting a circular mural in the front of the school.  If the height of the wall is 8m tall, what is the area of the largest possible mural?

50.24 m²

200

A 15m circular pool is being installed at a private home. However, the city requires a fence to go all around the pool for safety reasons.  How long is the fence? 

47.1 m

300

DOUBLE JEOPARDY

A circle is inscribed inside a square with an area of 400m².  What is the area of the circle?

400

A circular athletic track is being built.  It takes going around the track 4 full laps to walk a complete 1km.  What is the radius of the track? Round to the nearest hundredth.

0.04km

500

The distance from the center of Earth to the surface is around 3,965km.  What is the distance to go completely around Earth once in a straight line?

24,900km