Circles Practice

Front

What is an inscribed angle?

Back

An angle whose vertex lies on the circle and whose sides are chords of the circle.

Front

What is the formula for the area of a circle?

Back

πr²

Front

What is the difference between a radius and a diameter?

Back

A radius is half the length of a diameter.

Front

What do you call an arc with a measure less than 180 degrees?

Back

Minor Arc.

Front

What is the relationship between diameter and radius?

Back

The diameter is twice the radius.

Front

What is a central angle?

Back

An angle whose vertex is at the center of the circle and whose sides are radii.

Front

What is the circumference of a circle?

Back

The distance around the circle, calculated as 2πr.

Front

What is a chord in a circle?

Back

A line segment whose endpoints lie on the circle.

Front

What is a semicircle?

Back

An arc that measures exactly 180 degrees.

Front

What is a tangent to a circle?

Back

A line that touches the circle at exactly one point.