Circles

Circumfrence

100

What is the circumfrence of a circle, when radius is 2?

C= 12.56

200

What is the circumference of a circle with a diameter of 6?

C=18.8

300

What is circumference of a circle, when radius is 15?

C= 94.2

400

What is circumference of a circle, when diameter is 37?

C= 116.18

500

What is circumference of a circle, when radius is 103.5?

C= 649.99

Area

100

What is the area of a circle, when the diameter is 25?

What is the area of a circle, when the diameter is 25?490.63

200

What is area of a circle, when diameter is 14?

A= 153.86

300

What is area of a circle, when diameter is 35?

A= 961.63

400

What is area of a circle, when diameter is 78?

A= 4775.94

500

What is area of a circle, when diameter is 76?

A= 4534.16

Formulas

100

What is the formula for area of a circle?

A= 3.14*R^2

200

What is the formula for the circumference of a circle?

C= 3.14*D

300

What is the formula for area of a rectangle?

A= LxW

400

What is the formula for volume of a rectangular prism?

LxWxH

500

What is the formula for area of a trapezoid?

A= h(b1+b2)/2

Practice Problems

100

What is area of a circle, when radius is 3.4?

A= 36.29

200

What is area of a circle, when diameter is 97?

A= 7386.07

300

What is circumference of a circle, when diameter is 23?

C= 72.22

400

What is circumerfence of a circle, when radius is 4.6?

C= 28.88

500

What is circumfrence of a circle, when radius is 75?

C= 471

Diffucult Problems

100

What is ABOUT the diameter, when the circumference is 89? Round to the nearest hundredth.

Diameter= 28.35

200

What is ABOUT the diameter, when the circumference is 500?Round to the nearest hundredth.

Diameter= 159.24

300

What is ABOUT the diameter, when circumference is 789? Round to the nearest hundredth.

Diameter= 251.28

400

What is ABOUT the diameter, when circumference is 412? Round to the nearest hundredth.

Diameter= 131.22

500

What is the radius, when area is 200?

Radius= 8