Question

A hand fan is made up of cloth fixed in between the metallic wires. It is in
the shape of a sector of a circle of radius 21 cm and of angle 120° as
shown in the figure. Calculate the area of the cloth used and also find the
total length of the metallic wire required to make such a fan.​

Answer 1

Explanation:

The dimensions of equal strips are 25 cm, 25 cm and 14 cm.

Then area of each strip=

s(s−a)(s−b)(s−3)

=

32(32−25)(32−25)(32−14)

=

32×7×7×18

=168

Then total the area of each type of paper needed=168×5=840cm

2