Question

calculate the area of an equilateral triangle,whose height is 20cm​

Answer 1

Given height of equilateral triangle = 20 cm

Area of equilateral triangle with 

height 'h' = 3h2

∴ Area of equilateral triangle = 3(20)2

=3400×33

=34003 sq. cm

Given sides of triangle 

17 cm . 8 cm . 15 cm

By Pythagorous theorem

(15)2+(8)2=(17)2

It is a right angled triangle

∴ Area of triangle = 21×b×h

=21×15×8

= 60 sq cm