Circles

Front

What is the line segment between the center and a point on the circle called?

Back

Radius

Front

What does "circumference" mean?

Back

Distance around a circle

Front

If the diameter is 5 cm, what is the radius?

Back

2.5 cm

Front

Is the red line a radius or diameter of the circle?

Back

Radius

Front

What is the diameter of a circle?

Back

The longest distance across the circle, passing through the center.

Front

What is the formula for the circumference of a circle?

Back

C = πd or C = 2πr

Front

What is the relationship between radius and diameter?

Back

Diameter is twice the radius (d = 2r).

Front

What is a chord in a circle?

Back

A line segment with both endpoints on the circle.

Front

What is a tangent to a circle?

Back

A line that touches the circle at exactly one point.

Front

What is the area of a circle?

Back

A = πr²