Question

A hand fan is made by stitching lo equal size triangular strips of two different types of paper as shown in Fig. 12.28. The dimensions of equal strips are 25 cm, 25 cm and 14 cm. Find the area of each type of paper needed to make the hand fan.

Answer 1

Given that the sides of ∆AOB are 

AO = 24 cm 

OB = 25 cm 

BA = 14 cm 

Area of each equal strips = Area of ∆le AOB 

Now, for area of ∆AOB 

Perimeter of ∆AOB 

Let 2s = AO + OB + BA

∴ Area of each type of paper needed to make the hand fan