Circle Vocabulary

Front

What is a Semi-Circle?

Back

A Semi-Circle is an arc that represents half of a circle, measuring 180 degrees.

Front

What is a Major Arc?

Back

A Major Arc is an arc that measures more than 180 degrees, representing the longer path between two points on a circle.

Front

What is a Minor Arc?

Back

A Minor Arc is an arc that measures less than 180 degrees, representing the shorter path between two points on a circle.

Front

What is a Central Angle?

Back

A Central Angle is an angle whose vertex is at the center of the circle and whose sides intersect the circle.

Front

What is a Chord?

Back

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

Front

What is a Diameter?

Back

A Diameter is a special type of chord that passes through the center of the circle, dividing it into two equal halves.

Front

What is a Radius?

Back

A Radius is a line segment from the center of the circle to any point on the circle.

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

How do you calculate the circumference of a circle?

Back

Circumference = 2 × π × Radius.

Front

How do you calculate the area of a circle?

Back

Area = π × (Radius)².