Circles for 7th grade

Front

What is the distance from the center to any point on the circle?

Back

Radius

Front

If the circumference of a circle is 22 ft, what is the radius?

Back

11 ft

Front

Tom has a circular clock with a circumference of 39.88 inches. What is the radius of Tom's clock, to the nearest hundredth of an inch? (Use 3.14 for pi)

Back

6.35 inches

Front

If the radius of a circle is 5 feet, what is the area?

Back

78.5 feet squared

Front

Jack cut out two fabric circles of different sizes in his art class. The larger circle has a circumference of 22 inches, and the smaller circle has a circumference of 14 inches. What is the total area, to the nearest hundredth of a square inch, of the two circles? (Use 3.14 for pi)

Back

54.14 square inches

Front

What is the formula for the circumference of a circle?

Back

C = 2πr or C = πd

Front

What is the formula for the area of a circle?

Back

A = πr²

Front

What is the value of π (pi) approximately?

Back

3.14

Front

If the diameter of a circle is 10 feet, what is the radius?

Back

5 feet

Front

What is the relationship between diameter and radius?

Back

Diameter is twice the radius (d = 2r).