Question

solve this question​

Answer 1

angle is always 360 then,

$a. \: = \frac{1}{5} \times 360 \\ \frac{360}{5} \\ = 72$
$b. \: \frac{1}{2} \times 360 \\ = \frac{360}{2} \\ = 180$
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Answer 2

angle always 360 then 1/5 ×360=72
1/2×360 =180