Circles

Front

What is the measure of the angle formed by two radii of a circle?

Back

Central Angle.

Front

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

Back

Radius.

Front

What is the longest chord in a circle?

Back

Diameter.

Front

What do you call a line that touches a circle at exactly one point?

Back

Tangent.

Front

What is the term for a line segment whose endpoints lie on the circle?

Back

Chord.

Front

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

Back

14 cm.

Front

What is the formula for the circumference of a circle?

Back

C = 2πr, where r is the radius.

Front

What is the formula for the area of a circle?

Back

A = πr², where r is the radius.

Front

What is the relationship between the central angle and the arc length?

Back

Arc length = (Central angle/360) × Circumference.

Front

If the measure of arc AB is 68°, what is the measure of the central angle subtended by arc AB?

Back

68°.