Unit 8 Flashcard 1 Review: Circle parts, C, A, arcs & central angles

Front

What is a semicircle?

Back

A semicircle is half of a circle, formed by a diameter and the arc connecting the endpoints of the diameter.

Front

Name a semicircle formed by points A and D.

Back

AD is a semicircle.

Front

If the measure of arc ABC is 210°, what is the measure of ∠AOC?

Back

The measure of ∠AOC is 150°.

Front

What is the relationship between the measure of an arc and the angle at the center?

Back

The measure of the central angle is half the measure of the intercepted arc.

Front

What is the measure of arc AB if it is given as 142?

Back

The measure of arc AB is 142°.

Front

What is the measure of arc QRT if it is given as 199?

Back

The measure of arc QRT is 199°.

Front

What is the measure of arc WYZ if it is given as 231?

Back

The measure of arc WYZ is 231°.

Front

Define a central angle.

Back

A central angle is an angle whose vertex is at the center of a circle and whose sides are radii that intersect the circle.

Front

How do you calculate the measure of an arc?

Back

The measure of an arc can be calculated using the central angle that intercepts it.

Front

What is the total measure of a circle in degrees?

Back

The total measure of a circle is 360°.