Circle Vocabulary

Front

What is the distance from the center of a circle to any point on its circumference called?

Back

Radius

Front

Which line intersects a circle at exactly one point?

Back

Tangent

Front

Is a chord always a diameter?

Back

Sometimes

Front

What is a smaller piece of the circumference called?

Back

Arc

Front

What is the longest chord in a circle called?

Back

Diameter

Front

What do you call a line that intersects a circle at two points?

Back

Secant

Front

What is the angle formed at the center of a circle by two radii called?

Back

Central Angle

Front

What is the term for the distance around a circle?

Back

Circumference

Front

What is the formula for the circumference of a circle?

Back

C = 2πr or C = πd

Front

What is the relationship between the radius and diameter of a circle?

Back

Diameter = 2 × Radius