Question

A piece of wire of length 108cm is bent to form a semicircular arc bounded by its diameter.Find its radius and area enclosed

Answer 1

circumference of semicircle+diameter=total length of wire

πr+2r=108
so r=21

now area of semicircle where r =21
πr^2/2=693

Answer 2

Area of semicircle is 693 cm^2.