9.2 Radius & Diameter

Front

What is the radius of a circle?

Back

Half of the line that goes through the middle of a circle.

Front

What is the diameter of a circle?

Back

The line that goes through the middle of a circle, connecting two points on its edge.

Front

How do you calculate the diameter if you know the radius?

Back

Diameter = 2 x Radius.

Tags

CCSS.7.G.B.4

Front

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

Back

20m.

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.

Tags

CCSS.7.G.B.4

Front

Is the red line a radius or diameter of the circle if it connects the center to the edge?

Back

Radius.

Front

Is the red line a radius or diameter of the circle if it connects two points on the edge?

Back

Diameter.

Front

What is the formula for the area of a circle?

Back

Area = π x (Radius)^2.

Tags

CCSS.7.G.B.4

Front

What is the circumference of a circle?

Back

The distance around the circle, calculated as Circumference = 2 x π x Radius.

Tags

CCSS.7.G.B.4

Front

If a circle has a diameter of 30m, what is its radius?

Back

15m.

Tags

CCSS.7.G.B.4