Grade 7, Maths Olympiad (CBSE) - Area of Triangle 

Grade 7  |   Maths  |   Area of Triangle, Perimeter and Area, Olympiad, CBSE, ICSE, Maths Olympiad, Science Olympiad, English Olympiad

Perimeter of triangle:

Let AB = a, BC = b, CA = c

Perimeter = a+b+c

Semi-perimeter = (a+b+c)/2

Area of triangle = {root s(s-a)(s-b)(s-c)}

This is known as Heron's formula.

Area of an Isosceles triangle:

let equal sides be "a" and base "b"

Area of an isosceles triangle = 1 X b/2 X (root (a²-b²⁾/4)

Area of an equilateral triangle: root3 / 4 X a²