Question

d= 10cm है तो वृत का परिमाप निकाले

Answer 1

we know that 
perimeter of circle=$2 \pi r$
so 
it will also = $\pi d$            { d =2r }
therefore
$\frac{22}{7} * 10$
hence
$\frac{220}{7}$
which is equal to 31.42 approx.