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.

Tags

CCSS.7.G.B.4

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.

Tags

CCSS.HSG.C.A.2

Front

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

Back

5 cm.

Tags

CCSS.7.G.B.4

Front

What is the circumference of a circle?

Back

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

Tags

CCSS.7.G.B.4

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.

Tags

CCSS.HSG.GMD.A.1

Front

What is the relationship between diameter and radius?

Back

The diameter is twice the length of the radius.

Tags

CCSS.7.G.B.4

Front

What is the area of a circle?

Back

The area is calculated using the formula A = πr².

Tags

CCSS.7.G.B.4

Front

What is the center of a circle?

Back

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