Question

How do you find the perimeter of a 3/4 circle?

Answer 1

Let radius of circle is $r=18units$

Perimeter of full circle is given by $2\pi r$
Thus, perimeter of three quarters circle is given by,

$(\frac{3}{4}\times 2\pi r)+(2\times r)$
The perimeter of this "circle" would be:
$(\frac{3}{4}\times 2\times \pi \times 18)+(2\times 18)=27\pi +36\approx 120.78m$