Question

A rod of length 20 cm is bent in the form of an arc. If the central angle of this arc is 60 degree, then what is the perimeter of the circle?

Answer 1

Answer:

rod length=20cm

Area of circle whose angle central angle is 360° is

$2\pi x$

where alpha=radius

now for 60°= 2πx×60/360

2πx=6×20

=120cm

Thus 120cm is the perimeter of the circle!

thanku!