Circle Review

Front

What is the radius of a circle?

Back

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

Front

What is half of a circle called?

Back

A semicircle.

Front

What is the difference between a radius and a diameter?

Back

The radius is half the length of the diameter; the diameter is the distance across the circle through the center.

Front

If the diameter of a circle is 14 cm, what is the radius?

Back

7 cm.

Front

What is the formula for the circumference of a circle?

Back

Circumference = π × diameter.

Front

If the diameter of a circle is 10 m, what is the circumference using π = 3.14?

Back

31.4 m.

Front

What do you call a line segment that connects two points on a circle?

Back

A chord.

Front

What is the area of a circle with a radius of 5 cm?

Back

Area = π × radius² = 78.5 cm² (using π = 3.14).

Front

What is the term for the distance around a circle?

Back

Circumference.

Front

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

Back

8 inches.