Circles Review (10.1-10.3)

Front

What is the measure of a right angle in degrees?

Back

90°

Front

What is the definition of a diameter in a circle?

Back

A diameter is a line segment that passes through the center of the circle and has its endpoints on the circle.

Front

What is the measure of a semicircle?

Back

180°

Front

What is the difference between a major arc and a minor arc?

Back

A major arc is greater than 180°, while a minor arc is less than 180°.

Front

What is the formula for the circumference of a circle?

Back

C = πd or C = 2πr, where d is the diameter and r is the radius.

Front

What is the relationship between the radius and diameter of a circle?

Back

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

Front

What is a tangent line to a circle?

Back

A tangent line is a line that touches the circle at exactly one point.

Front

How do you determine if a line is tangent to a circle?

Back

A line is tangent to a circle if it is perpendicular to the radius at the point of contact.

Front

What is the measure of arc LM if it is a quarter of the circle?

Back

90°

Front

If segment TR is a diameter, what is the measure of arc TAR?

Back

180°; it is a semicircle.