Question

An umbrella is made up by stitching some triangular

pieces of clothes of too different colours, each
piece measuring
25 cm, 25cm and 14cm so that
1680 cm2 of clothes is required. If the cost of
each triangular piece of the cloth is Rs. 101, find
the total cost of cloth.​

Answer 1

there are 10 triangles

5 triangles of blue colors

and 5 triangles of grey colors

area of each cloths = 5 × (area of 1 triangle)

Explanation:

Area of triangle

• Area of triangle = √s(s - a)(s - b)(s - c)
• Here, s is the semi-perimeter
• and a,b,c are the the side of the triangle