Question

1. find the perimeter of a regular octagon of side 4.5cm

2. find the perimeter of regular decagon of side 3.6cm ​

Answer 1

$\huge\mathbb{SOLUTION:-}$

$\bold{Given}\begin{cases}\sf{side\:of\: octagon=4.5cm}\\ \sf{Side\:of\: decagon=3.6cm}\end{cases}$

• We have to find their perimeter

$\sf\underline{\purple{\:\:\:A.T.Q\:\:\:}}$

• Now the perimeter of Octagon

• Octagon has 8 sides

we know that

$\boxed{\sf{perimeter=sum\: of \:All \:sides}}$

$\sf Perimeter=8\times 4.5\\ \\ \sf\implies Perimeter \:of \:octagon = 36cm$

• Now the perimeter of decagon

Decagon has 10 sides

$\sf\implies Perimeter= 10\times 3.6\\ \\ \sf\implies Perimeter\: of \:Decagon= 36cm$

$\boxed{\sf{\blue{Perimeter\:of\: octagon= 36cm}}}$

$\boxed{\sf{\purple{Perimeter\:of\: Decagon= 36cm}}}$