Circle Review

Front

What is the formula for the area of a circle?

Back

The formula for the area of a circle is πr², where r is the radius.

Front

What is the formula for the circumference of a circle?

Back

The formula for the circumference of a circle is πd, where d is the diameter.

Front

If the radius of a circle is 6 cm, what is the diameter?

Back

The diameter is 12 cm.

Front

What is the circumference of a circle with a diameter of 13.5 inches?

Back

The circumference is 42.39 inches.

Front

How far does a car travel in one lap around a circular track with a diameter of 1/2 mile?

Back

The car travels 1.57 miles.

Front

Define radius in the context of a circle.

Back

The radius is the distance from the center of the circle to any point on its circumference.

Front

Define diameter in the context of a circle.

Back

The diameter is the distance across the circle through its center, equal to twice the radius.

Front

What is the relationship between radius and diameter?

Back

The diameter is twice the length of the radius (d = 2r).

Front

What is the approximate value of π (pi)?

Back

The approximate value of π is 3.14.

Front

If the radius of a circle is doubled, how does the area change?

Back

If the radius is doubled, the area increases by a factor of four.