Circumference & Area of Circles & Semi-Circles

The definition of diameter is

• distance from the center of any point on the circle

• distance across the circle through the center

• distance from one point to another

• distance around the circle

Tags

CCSS.HSG.C.A.2

The definition of radius is

• distance from one point to another point

• distance around the circle

• distance from the center to any point on the circle

• distance across the circle through the center

Tags

CCSS.HSG.C.A.2

what is the formula for finding diameter

• r = 2 d

• d = 2 r

• a = m c²

• c = π 2 r

Tags

CCSS.7.G.B.4

what is the formula for finding radius

• c = π d

• c = 2 π r

• d = r/2

• r = d/2

Tags

CCSS.7.G.B.4

what is the formula for finding area of a circle

• C = π r²

• A = π r²

• A = π r² / 2

• C = 2 π r

Tags

CCSS.7.G.B.4

what is the formula for finding the area of a semi-circle

• A = π r²

• C = π r²

• A = π r² / 2

• A = 2 π r

Tags

CCSS.7.G.B.4

Find the area of the circle

• 43.96
• 153.86
• 87.82
• 307.72

Tags

CCSS.7.G.B.4

find the area of the circle below.

• 100 cm
• 225 cm
• 9 cm
• 28.26 cm

Tags

CCSS.7.G.B.4

Mrs. Wilson placed the welcome mat shown below on her front door step. What is the area of her welcome mat in square feet? Leave in terms of π.

• A = 2π
• A = 8π
• A = 10π
• A = 4π

Tags

CCSS.7.G.B.4

Find the area of the circle

• 8π
• 9π
• 71π
• 81π

Tags

CCSS.7.G.B.4