Semi and Quarter Circles

What is the formula to find the area of a circle?

• A = πd

• A = 2πr

• A = πr²

• A = xyz

What is the area of this circle?

• 163.2
• 15.3
• 124.2
• 113.1

What is the area of this circle?

• 1256.64

• 31.41

• 314.16

• 123.12

What is the area of this circle?

• 62.59
• 113.1
• 19.81
• 28.27

What is the area of this circle?

• 201.06
• 50.27
• 123.12
• 94.43

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

what is this shape called

• circle

• semi circle

• moon

• triangle

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 area of this semicircle ?
d = 8 cm 

• 100.48 cm²
• 80 cm²
• 200.96 cm²
• 25.12 cm²

Find the area of the quarter circle. Round you answer to the nearest hundredth.

• 58.88

• 78.50

• 7.85

• 157.00