Question

Find the area of isosceles triangle whose equal side is of 18cm and the perimeter of the triangle is 42cm

Answer 1

Answer:

Step-by-step explanation:

Perimeter= Sum of 3 sides

Let the unequal base be x

42=18+18+x

x=6cm

Area of triangle=(Height×base) /2

Height²=Side²-(base/2) ²=

18²-3²=315

Height²=315

Height=√315

Area=(√315×6) /2=3√315