Area of Semi-Circles

what is the area of this semicircle ?
d = 8 cm 

• 100.48 cm²

• 80 cm²

• 200.96 cm²

• 25.12 cm²

Jesse used rope to stake a circular region in which to plant a garden. The diameter of the region is 20 inches. What is the approximate area of half of the garden?

• 31.4 in²

• 314 in²

• 157 in²

• 628 in²

What does area mean?

• the distance around a shape

• half the distance around a shape

• the amount of space outside a shape

• the amount of space inside a shape

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

Determine the area of the semicircle above.

Mathematical Equivalence

ON

what is the area of this semicircle ?

• 100.48cm²

• 80cm²

• 200.96cm²

• none of the above

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

• A = π r²

• C = π r²

• A = 1/2 π r²

• A = 2 π r

• A = 2π r²

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

• A = 25.12 sq. inches

• A = 50.24 sq. inches

• A = 31.4 sq. inches

• A = 12.56 sq. inches

A semi-circle is half of a circle. How should the Area formula be changed so that it gives you the Area of a Semi-Circle?

What is the area of this semi circle? 

• 100.5 square cm

• 25.1  square cm

• 50.3 square cm

• 12.6 square cm