Question

An umbrella is made by stitching 12 triangular pieces of cloth, each measuring (50×20×50). find the area of the cloth used in it.

Answer 1

using herons formula
s=50+20+50/2
s=60
s-a= 60-50=10
s-b=60-50=10
s-c=60-20=40
area =60×10×10×40 whole root
200root6
then 12 piece = 200root6 ×12