Question

The area of a semicircle is 1.57 square centimetres. What is the semicircle's perimeter? Use 3.14 for ​pi

Answer 1

Answer:

314

Step-By-Step Explanation:

Area in m= 1.57* 10000= 15700

Area of semi circle= 1/2*pie*r^2

$15700= \frac{1}{2} \times 3.14 \times {r}^{2}$

$\frac{15700 \times 2}{3.14} = {r}^{2}$

${ r}^{2} = \frac{15700 \times 100 \times 2}{314}$

${r}^{2} = 400 \times 100$

$r = \sqrt{40000}$

$r = 200$

Perimeter of semi circle= 1/2*pie*r

$= \frac{1}{2 } \times 3.14 \times 200 = 314$

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