Question

Meena wants to make a cloth mask by joining two equal size triangular pieces of sides 5cm,8cm and 5cm.how much cloth has she required​

Answer 1

Answer:

24 cm ²

Step-by-step explanation:

By the given information it is understood that the triangle is isosceles triangle with the equal sides of 5 cm and the base with 8 cm.

Area=√s(s - a)(s - b)(s - c)

First we need to find out the s that is semi perimeter.

s= s (semi - perimeter) = (a + b + c)/2

let the sides of the triangle be = a,b,c

a = 5 cm

b = 5 cm

c = 8 cm

=> s = 18 cm/2

=> s = 9 cm

Area= √s(s - a)(s - b)(s - c)

Area= √9(9-5)(9-5)(9-8)

area = √9*4*4*1

area = √3*3*2*2*2*2*1*1

area= 3*2*2*1

area = 12 cm ²

This is the area for one triangular piece and to find for two we need to multiply area of 1 triangle by 2

:. 12 *2

24cm²

Hope my answer helps you............