Circles and Two Step Equations Review Week 3

Parts Of A Circle

100

What do you call the measurement that goes around the curve of the circle?

Circumference

200

What is a line that cuts a circle into two equal parts that runs down its center called?

Diameter

300

A line that goes from the center of the circle outward and is also half of the diameter?

Radius

400

what is the ratio of Circumference to Diameter or...

C/d =

Pi - 3.14...

500

Pi x r x r = ?

Area

Squaring a number

100

2²

4

200

3²

9

300

4²

16

400

5²

25

500

7²

49

Finding Radius and Diameter

100

r= 6

what is diameter

12

200

r = 7

what is diameter?

14

300

d= 10

what is radius?

r = 5

400

d= 20

What is the radius?

r = 10

500

r= 75

what is diameter?

150

Finding Circumference

100

C = 2 x Pi x Radius  or C = Pi x Diameter

Pi = 3.14...

Radius is 2, what is the circumference?

12.56

200

C = 2 x Pi x Radius  or C = Pi x Diameter

Pi = 3.14...

Radius is 4, what is the circumference?

25.12

300

C = 2 x Pi x Radius  or C = Pi x Diameter

Pi = 3.14...

Radius is 6, what is the circumference?

37.68

400

C = 2 x Pi x Radius  or C = Pi x Diameter

Pi = 3.14...

Diameter is 12 what is circumference?

37.68

500

C = 2 x Pi x Radius  or C = Pi x Diameter

Pi = 3.14...

Diameter is 15 what is circumference?

47.1

Finding Area

100

Area = Pi x r² 

Area = Pi x r x r

Pi= 3.14

r = 3

what is the area?

28.26

200

Area = Pi x r²

Area = Pi x r x r

Pi= 3.14

r= 4

what is the area?

50.24

300

Area = Pi x r²

Area = Pi x r x r

Pi= 3.14

r= 10

what is the area?

314

400

Area = Pi x r²

Area = Pi x r x r

Pi= 3.14

d= 40

what is the area?

1,256

500

Area = Pi x r²

Area = Pi x r x r

Pi= 3.14

d=50

what is the area?

1,962.5