Maths-
General
Easy
Question
An isosceles triangle has perimeter 30 cm and each of the equal sides is 12 cm. Find the area of triangle.
Hint:
Use the formula ,
The correct answer is: 34.86 cm2
Let length of the third side = b
It is given that perimeter of triangle = 30 cm
12 + 12 + x = 30
x = 30 – 24 = 6 cm
Area of an isosceles triangle = 
where a is length of equal side and b is third side
So, a = 12 and b = 6 cm
Area of an isosceles triangle = 
= 
= 34.86 cm2
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