Question

A regular polygon with an exterior angle of 20° .

Answer 1

Since regular polygon has same sides, the perimeter of other sides are also 6cm

i found out there are 9 sides. so if question A is asking the perimeter of the whole sides except the one mentioned it will be 6cm×8 = 48cm

for question B
$use \: the \: formula \: area = \frac{a \times p}{2}$
the answer is 222.55cm squared