Circles

Front

What is a 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 a semicircle?

Back

A semicircle is half of a circle.

Front

How do you calculate the radius from the diameter?

Back

Divide the diameter by 2.

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

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

Back

5 cm.

Front

What is the circumference of a circle?

Back

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

Front

What does π (pi) represent in circles?

Back

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

Front

What is the relationship between diameter and radius?

Back

The diameter is twice the length of the radius.

Front

What is the area of a circle?

Back

The area is calculated using the formula A = πr².

Front

What is the center of a circle?

Back

The center is the point that is equidistant from all points on the circumference.