Question

Find the area of triangle, sides are 18m, 14m and perimeter 42m by using Heron's formula.​

Answer 1

Perimeter of a triangle= sum of all three sides

Let the third side be x

18m+14m+x= 42m

x= 42-32m

x= 10m

Step-by-step explanation:

s=(a+b+c)÷2

s= 42/2=21m

Heron's formula = √s(s-a)+(s-b)+(s-c)

√21 (21-18) +(21-14) +(21-10)

√21×3×7×11

=21√11