Circles

Front

The distance all the way across the circle through the center is called the ______________________.

Back

Diameter

Front

What is the formula to find the area of a circle?

Back

Area = πr², where r is the radius.

Front

The distance from the center of the circle to any point on the circle is called the ______________________.

Back

Radius

Front

What is the circumference of a circle?

Back

The distance around the circle, calculated as C = 2πr or C = πd.

Front

If the radius of a circle is 7 in, what is the area?

Back

Area = π(7)² ≈ 153.94 in².

Front

What is the relationship between diameter and radius?

Back

Diameter = 2 × Radius.

Front

The amount of space inside a circle is called the ______________________.

Back

Area

Front

If the diameter of a circle is 10 in, what is the radius?

Back

Radius = Diameter / 2 = 5 in.

Front

What is the circumference of a circle with a diameter of 10 in?

Back

Circumference = π × Diameter ≈ 31.42 in.

Front

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

Back

Diameter (if it passes through the center).