1.2 - Area and Circumference

Front

What is the formula for the circumference of a circle?

Back

C = 2πr or C = πd, where r is the radius and d is the diameter.

Front

What is the formula for the area of a circle?

Back

A = πr², where r is the radius.

Front

What is the radius of a circle?

Back

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

Front

What is the diameter of a circle?

Back

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

Front

How do you find the radius if you know the diameter?

Back

Radius = Diameter / 2.

Front

If the radius of a circle is 6 cm, what is the diameter?

Back

Diameter = 12 cm.

Front

If the radius of a circle is 6 cm, what is the circumference?

Back

C = 2π(6) ≈ 37.68 cm.

Front

If the radius of a circle is 6 cm, what is the area?

Back

A = π(6)² ≈ 113.10 cm².

Front

What does 'circumference' mean?

Back

Circumference is the distance around a circle.

Front

What does 'area' mean in the context of a circle?

Back

Area is the space a circle takes up.