Circles

Front

What is a circle?

Back

A circle is a shape consisting of all points in a plane that are a fixed distance from a center point.

Front

What is the center of a circle?

Back

The center of a circle is the point that is equidistant from all points on the circle.

Front

What is a radius?

Back

The radius is the distance from the center of a circle to any point on its circumference.

Front

What is a diameter?

Back

The diameter is a line segment that passes through the center of the circle and has its endpoints on the circle. It is twice the length of the radius.

Tags

CCSS.HSG.C.A.2

Front

How do you calculate the circumference of a circle?

Back

Circumference can be calculated using the formula C = πd, where d is the diameter.

Tags

CCSS.7.G.B.4

Front

What is the relationship between radius and diameter?

Back

The diameter is twice the length of the radius (d = 2r).

Tags

CCSS.7.G.B.4

Front

What is the formula for the circumference of a circle with radius r?

Back

C = 2πr.

Tags

CCSS.7.G.B.4

Front

If the radius of a circle is 5 inches, what is the circumference?

Back

C = 2π(5) = 10π inches.

Tags

CCSS.7.G.B.4

Front

What is the area of a circle?

Back

The area of a circle is calculated using the formula A = πr².

Tags

CCSS.7.G.B.4

Front

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

Back

The radius is 5, since r = d/2.

Tags

CCSS.7.G.B.4