Circles Flashcard Review

Front

What is a circle?

Back

A circle is a shape consisting of all points in a plane that are at a given distance (radius) from a fixed point (center).

Front

Define radius in a circle.

Back

The radius is the distance from the center of the circle to any point on its circumference.

Front

What is a diameter?

Back

The diameter is a line segment that passes through the center of the circle and has its endpoints on the circle. It is twice the length of the radius.

Front

What is an arc in a circle?

Back

An arc is a portion of the circumference of a circle.

Front

Differentiate between a minor arc and a major arc.

Back

A minor arc is an arc that is less than 180 degrees, while a major arc is more than 180 degrees.

Front

What is a semi-circle?

Back

A semi-circle is an arc that is exactly half of a circle, measuring 180 degrees.

Front

How do you calculate the length of an arc?

Back

Arc length = (θ/360) × 2πr, where θ is the angle in degrees and r is the radius.

Front

What is the relationship between angles and arcs in a circle?

Back

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

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 that intersect the circle.

Front

Define a chord in a circle.

Back

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