Centers of Circles

Equal _____ of the congruent circles subtend equal angles at the centers.

• Segments

• Radii

• Arcs

• Chords

If chords AB and CD of congruent circles subtend equal angles at their centres, then:

• AB=CD

• AB > CD

• AB < AD

• None of above

In the figure, O is the centre of the circle. What is the measure of ∠ACB?

• 45⁰

• 60⁰

• 70⁰

• 90⁰

In the figure, if O is the centre of a circle, then the measure of ∠ACB is:

• 80⁰

• 100⁰

• 40⁰

• 60⁰

Graph the following circle equation on desmos x² + y² + 4x + 6y - 36 =0. Then determine the center.

• (-2, 5)

• (2, 7)

• (-2, -7)

• (-2, -3)

Tap/Click the center of the circle

The point of concurrency of the three perpendicular bisectors of the sides of a triangle

• Incenter

• Concurrent

• Equidistant

• Orthocenter

• Circumcenter

If S is the incenter, what type of segments are drawn?

• medians

• angle bisectors

• perpendicular bisectors