Question

The length of a regular pentagon is
$3 \frac{1}{4} cm.$
Find its perimeter.​

Answer 1

Answer:

$A</p><p></p><p>=</p><p></p><p> \frac1</p><p>4 \sqrt{5(5 + 2 \sqrt{5)} } {a}^{2} \\ \frac1</p><p>4 \sqrt{5(5 + 2 \sqrt{5)} } {3.25}^{2} \\ = > \: 18.7254</p><p>$