Question

The area of semicircle is 173.25 cm^2. Find it’s perimeter

Answer 1

Answer:

area of semi circle=173.25 cm².

so, area of full circle=2×173.25 cm²= 346.5

=> pi r²= 346.5

=>22/7×r²=346.5

=>r²=346.5×7/22=110.25.

=> r=

$\sqrt{110.25}$

=10.5

therefore, perimeter or circumference of the circle= 2 pi r= 2×22/7×10.5=66cm. ans.

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Answer 2

Answer:

54 cm

Step-by-step explanation:

Area of a semi-circle with radius ‘r’ = πr²/2

r ² = 173.25× (7/22)× 2

r² = 110.25

r = √110.25

r = 10.5 cm

Perimeter of a circle = πr + 2r

Perimeter = (22/7)(10.5) + 2(10.5)

Perimeter = 33 + 21

Perimeter = 54 cm

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