Circles, Circles, Circles

Front

What is the diameter of a circle?

Back

The diameter is the distance across the circle through its center, equal to twice the radius.

Front

How do you calculate the radius from the diameter?

Back

Divide the diameter by 2.

Front

What is the formula for the area of a circle?

Back

Area = π × radius².

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

If the radius of a circle is 18, what is the diameter?

Back

Diameter = 2 × radius = 36.

Front

What is π (pi)?

Back

π (pi) is a mathematical constant approximately equal to 3.14, representing the ratio of the circumference of a circle to its diameter.

Front

What is the circumference of a circle?

Back

Circumference = 2 × π × radius.

Front

If the area of a circle is 254.34, what is the radius?

Back

Radius = √(Area/π) = √(254.34/3.14) ≈ 9.

Front

What is the relationship between diameter and radius?

Back

The diameter is twice the length of the radius.

Front

How do you find the area of a circle with a radius of 14?

Back

Area = π × (14)² ≈ 615.75.