8.1-8.2 review

Front

What is the diameter of a circle?

Back

The distance from an edge of a circle to another edge through the center.

Front

What is the formula for circumference of a circle given the diameter?

Back

C = π x D

Front

What does the diameter of a circle represent?

Back

The longest distance across the circle, passing through the center.

Front

What is the relationship between diameter and radius?

Back

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

Front

If the diameter of a circle is 7, what is the radius?

Back

3.5 (radius is half of the diameter).

Front

What is the circumference of a circle with a diameter of 5? (Use π = 3.14)

Back

Circumference = π x D = 3.14 x 5 = 15.7.

Front

What is the perimeter of a circle called?

Back

Circumference.

Front

How do you calculate the area of a circle?

Back

Area = π x r².

Front

What is the radius of a circle?

Back

The distance from the center of the circle to an edge.

Front

If a circle has a radius of 4, what is its diameter?

Back

8 (diameter is twice the radius).