Geometry Unit 6 Circles Flashcard Review

Front

What is a diameter in a circle?

Back

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

Front

What is a radius in a circle?

Back

A radius is a segment that connects the center of the circle to any point on the circle.

Front

What is a chord in a circle?

Back

A chord is a segment whose endpoints lie on the circle.

Front

How do you find the measure of an angle formed by two chords?

Back

Use the formula: m∠ = 1/2(mArc1 + mArc2), where mArc1 and mArc2 are the measures of the intercepted arcs.

Front

What is the relationship between the diameter and radius?

Back

The diameter is twice the length of the radius. Formula: Diameter = 2 × Radius.

Front

What is the formula for the circumference of a circle?

Back

Circumference = π × Diameter or Circumference = 2 × π × Radius.

Front

What is the area of a circle?

Back

Area = π × Radius².

Front

What is the central angle of a circle?

Back

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

Front

What is an inscribed angle?

Back

An inscribed angle is an angle formed by two chords in a circle which have a common endpoint.

Front

What is the relationship between an inscribed angle and its intercepted arc?

Back

The measure of an inscribed angle is half the measure of its intercepted arc.