Question

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Answer 1

Area=

$\pi \times r {}^{2}$

1)To find radius diameter/2

21.5÷2=10.75

$10.75 {}^{2} \times \pi = 362.87$

area =362.87cm

2)

$\pi \times 13.2 {}^{2} = 547.39$

area=547.39cm

Answer 2

a)

Area = pie × ( 21.5 / 2 )^2

Area = pie × ( 10.75 )^2

Area = pie × 115.5625

Area = 3.14 × 115.5625

Area = 362.86625 cm^2

___________________________

b)

Area = pie × ( 13.2 )^2

Area = pie × 174.24

Area = 3.14 × 174.24

Area = 547.1136 ft^2