Circle Review

Form it

100

The formula to find the radius 

Diameter / 2 

200

The formula to find the circumference 

C = 3.14 x Diameter 

C = 3.14 x Radius x 2 

300

The formula to find the radius with the circumference 

Circumference/ 2 x 3.14 

400

Formula for the area of a circle 

A = 3.14 x r²

500

DAILY DOUBLE 

First 30 digits of pi 

About it

100

What is the fraction form of pi 

22/7

200

What day is Pi Day? 

March 14 

300

When was the pi symbol first used? 

1706

400

Pi is the ratio between what two things 

Circumference and the diameter 

500

What did the Egyptians estimate pi to be? 

3.16

Circle 1

100

The line that goes across a circle through the center 

Diameter 

200

D = 78 m.   What is the radius? 

39 m

300

R = 6.7 inches.  What is the diameter? 

13.4

400

Give the 5 parts of a circle 

1) Radius 

2) Diameter 

3) Center

4) Circle 

5) Circumference 

500

Give the first 20 digits of Pi 

3.1415926535897932384

Circle 2

100

Radius is 18 inches. What is the circumference? 

113.04 inches 

200

The diameter of a semicircle is 13 meters. What is the circumference of it? 

33.41 meters

300

C = 56 inches.  What is the radius? 

8.92 (rounded hundredth) 

400

C= 105. What is the diameter? 

33.44 (rounded hundreths) 

500

Radius is 6.2 cm. 

What is the diameter?

What is the Circumference?

D = 12.4 cm 

C = 38.94 cm 

Circle 3

100

DAILY DOUBLE 

D = 16 m 

R ?

C?

A? 

200

The diameter is 15 m. What is the area? 

176.63 m²

300

R = 19 m. What is the area? 

1133.54 m²

400

The Radius is 5.5 m 

What is the diameter? 

What is the circumference? 

What is the area? 

D = 11 m

C = 34.54 m 

A = 94.99 m²

500

The Diameter is 24 in. What is the circumference and area? 

C = 75.36

A = 452.16 in²