Question

find the perimeter of these both figures with the explanation please....​

Answer 1

Answer:

Perimeter for a circle means circumference.

Figure A is a sector so

$\frac{90}{360} \times \pi {r}^{2}$

$\frac{1}{4} \times \frac{22}{7} \times 21 \times 21$

$\frac{11 \times 21 \times 3}{2}$

$\frac{693}{2} = 346.5 \: {m}^{2}$

Figure B

is whole circumference - sector

$\pi {r}^{2} = \frac{22}{7} \times 0.7 \times 0.7$

$= 1.54 \: {m}^{2}$

$\frac{90}{360} \times \frac{22}{7} \times 0.7 \times 0.7$

$= 0.385$

$1.54 - 0.385 \\ = 1.155 \: {m}^{2}$

Hope it helps...

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