Semicircles and Quarter Circles

What is the formula for area of a semicircle?

• A =  $\frac{1}{2}$  π

• A =  $\frac{1}{2}$  πr

• A =  $\frac{1}{2}$  πd

• A =  $\frac{1}{2}$  πr²

Tags

CCSS.7.G.B.4

Find the area of this Semicircle with a diameter of 18 cm. (Take π = 3.14)   

• 254.34 cm

• 127.17 cm

• 56.52 cm

• 28.26 cm

Tags

CCSS.7.G.B.4

Find the area of this quarter circle with a radius of 6 cm. (Take π = 3.14)

• 56.52 cm

• 113.04 cm

• 28.26 cm

• 37.68 cm

Tags

CCSS.HSG.C.B.5

Xuan Rong placed the 'WELCOME' mat shown on her front door step. What is the area of her mat in cm² ? (Take π = 3.14)

• 3925 cm²

• 7850 cm²

• 15 700 cm²

• 31 400 cm²

Tags

CCSS.7.G.B.4

What is the area of the yellow quarter circle? Leave the answer in terms of $\pi$ .

• 25π m²

• 6.25π m²

• 5π m²

• 1.25π m²

Tags

CCSS.HSG.C.B.5

Find the area of the figure. Round your answer to 2 decimal places. (Use the value of  $\pi$  in your calculator)

The area of the figure is ________  $cm^2$ . 

The figure shows 3 semicircles. Find the area of the shaded part. (Take  $\pi\ =\ \frac{22}{7}$ )


The area of the shaded part is __________  $cm^2$ . 

Tags

CCSS.7.G.B.4

Find the area of the figure. (Take  $\pi\ =\ \frac{22}{7}$ )


The area of the figure is ________  $cm^2$ .