Perimeter and Area of Semi-Circles

What is the perimeter of the semi-circle?

• 11 yd

• 17.27 yd

• 34.54 yd

• 28.27 yd

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

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.

• 2π

• 8π

• 10π

• 4π

What is the area of this semi circle? 

• 100.5 square cm

• 25.1  square cm

• 50.3 square cm

• 12.6 square cm

What is the perimeter of the semi-circle?

• 11 yd

• 17.27 yd

• 34.54 yd

• 28.27 yd

What is the area of this composite shape? (Use 3.14 = π and round to the nearest tenths place)

• 21

• 19.2

• 40.2

• 42

The diagram below shows the dimensions of Mrs. Patterson’s new swimming pool. A cover is needed for the pool, what will be the approximate area of the cover?

• 720

• 139.08

• 580.92

• 238.5

What is the perimeter of the semi-circle?

• 11 yd

• 17.27 yd

• 34.54 yd

• 28.27 yd

Find the perimeter

• 14 m

• 43.96m

• 176 m

• 191.96 m

Find the perimeter of the figure.  Use 3.14 for pi.

• 20.56 in.

• 17.3 in.

• 17.8 in.

• 31.88 in.