Circumference & Area of Circles & Semi-Circles

Front

What is the formula for finding the area of a semi-circle?

Back

A = π r² / 2

Tags

CCSS.7.G.B.4

Front

The definition of radius is:

Back

Distance from the center to any point on the circle.

Front

What is the area of a circle with a radius of 9?

Back

81π

Tags

CCSS.7.G.B.4

Front

What is the circumference of a circle with a diameter of 14 cm?

Back

43.98 cm

Tags

CCSS.7.G.B.4

Front

What is the formula for finding the radius from the diameter?

Back

r = d / 2

Tags

CCSS.7.G.B.4

Front

What is the formula for finding the circumference of a circle?

Back

C = 2πr or C = πd

Tags

CCSS.7.G.B.4

Front

If the radius of a circle is 5 cm, what is the area?

Back

25π

Tags

CCSS.7.G.B.4

Front

What is the relationship between diameter and radius?

Back

Diameter is twice the radius (d = 2r).

Tags

CCSS.7.G.B.4

Front

What is the formula for the area of a circle?

Back

A = π r²

Tags

CCSS.7.G.B.4

Front

If the circumference of a circle is 31.4 cm, what is the radius?

Back

5 cm (C = 2πr => r = C / 2π).

Tags

CCSS.7.G.B.4