Question

Find area of semi circle whose diameter is 42 cm

Answer 1

Area of semicircles = πr square

so r = 21 .

so 22/7 multiply 21 and 21 and

we get 66 multiply 21=

..

I hope this may helps you

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Answer 2

Answer:

area of circle=

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

area of semi circle=

$\frac{ {\pi \: r}^{2} }{2}$

radius=42÷2

=21cm

$\frac{ \frac{22}{7} \times {21}^{2} }{2}$

$\frac{7 \times 21 \times 21}{22 \times 2} {cm}^{2}$

simplify it...

and answer will be there...