Q4 of 69 Page 250

Find the area of an equilateral triangle having each side 6cm.

Let us assume each side of the equilateral triangle be a

It is given that,

Side of equilateral triangle = 6 cm

We know that,

Area of equilateral triangle = a²

= 9 cm²

The perimeter of an isosceles right- angled triangle having a as each of the equal sides is

For an isosceles triangle having base = 12 cm and each of the equal sides equal to 10 cm, the height is

Using Heron’s formula find the area of Δ ABC in which BC = 13 cm, AC = 14 cm and AB = 15cm.

The sides of a triangle are in the ratio 13: 14: 15 and its perimeter is 84 cm. Find the area of the triangle.