Question

The radius of a quarter circle is 1 millimeter. What is the quarter circle's perimeter?

Use 3.14 for ​𝜋.

Answer 1

Solution:

$r=1mm;$

Find: $p$ = perimeter of quarter circle.

$p=2r+l;$ here $l$ = arc length.

$l=\frac{2\pi r}{4}=\frac{2\times3.14\times1mm}{4}=1.57mm;$

$p=2\times1mm+1.57mm=3.57mm;$

Answer:

$p=3.57mm.$