Area and Circumference

Radius/Diameter

100

If the radius is 5 what is the diameter?

10

200

A straight line passing from side to side through the center of a circle

Diameter

300

If the radius is 30 the diameter is?

60

400

If the diameter is 20 what is the radius?

10

500

What is the definition of radius?

A line segment that starts from the center of the circle to any point on the circle. It is half the diameter.

Circumference

100

Find circumference: When radius = 5

31.4

200

What is the circumference of a circle with a diameter of 4?

12.56

300

What is the radius when the circumference is 50.24 inches?

8 inches

400

What is the diameter of a circle with a circumference of 69.08m?

22m

500

Abby has a circular walking path by her house. She looked on a map and saw the radius of the path was about 150 feet. If she walks around the path 4 times, about how far will she walk?

3768 feet

Area

100

Find the area of a circle when the radius = 4

50.24

200

Find the area of a circle when the diameter = 28

615.44

300

Find the radius when the area of the circle is 1,384.74m².

21m

400

Find the diameter of the circle when the area is 3,846.5 inches²

70 inches

500

Spell your Math Student teacher's last name.

Rands

Surface Area

100

What is the surface area of a cylinder with a height of 4m and a radius of 3m?

131.95m²

200

What is the surface area of a cylinder with a height of 82 inches and a diameter of 62 inches?

22010 inches²

300

What is the surface area of a cylinder with a height of 15cm and a radius of 15cm?

2827.43cm²

400

What is the height of a cylinder if the surface area is 6088.41 units² and the radius is 17 units?

40 units.

500

When solving 5x+4=39, list out the steps you would do to solve for x. 

Subtract 4 from both sides and divide both sides by 5 to get x = 7.

Formulas

100

Circumference of a circle

C = 3.14 * d

or 

C = 2 * 3.14 * r

200

Area of a circle

A = 3.14 * r²

^or 

^{A = 3.14 * r * r}

300

Surface area of a cylinder

SA = 2*3.14*r² + 2*3.14*r*h

400

d = 

d = 2r

500

What are 2 ways you could write the constant that appears in almost every formula that has to deal with circles?

pi, 3.14, greek letter