Question

the age of triangular board are 6 CM 8 cm and 10 cm calculate the cost of painting it at the rate of 9 Paisa per CM square

Answer 1

Given side are 6cm 8 cm and 10cm.
so according to heros formula
s = 6+8+10/2 = 12

area =
$\sqrt{12(12 - 6)(12 - 8)(12 - 10)}$
= 12*6*4*2 = 24

cost of painting = 24*9 = 216p
= ₹2.16