Circles Circles Circles

Front

What is the formula for circumference of a circle given the diameter?

Back

C = π d

Front

What is the diameter of a circle if the circumference is 31.4?

Back

Diameter = 10

Front

What is the radius of a circle if the diameter is 20?

Back

Radius = 10

Front

What is the area of a circle with a radius of 5?

Back

Area = π r² = 25π

Front

What is the relationship between diameter and radius?

Back

Diameter = 2 × Radius

Front

What is a tangent to a circle?

Back

A line that touches the circle at exactly one point.

Front

What is the formula for the area of a circle?

Back

Area = π r²

Front

If the radius of a circle is doubled, what happens to the area?

Back

The area becomes four times larger.

Front

What is the value of x if the circumference is 62.8?

Back

x = 20 (Diameter) or x = 10 (Radius)

Front

What is the length of the hypotenuse in a right triangle formed by a radius and a tangent?

Back

Hypotenuse = √(Radius² + Tangent²)