Maths-
General
Easy
Question
Find the area of a triangle, two sides of which are 18 cm and 10 cm and the perimeter is 42 cm.
Hint:
Find third side using perimeter
The correct answer is: 69.65 cm2
Let third side be x
It is given that Perimeter of triangle = 42 cm
18 + 10 + x = 42
x = 42 – 28 = 14
So, length of third side is 14 cm
Using Heron’s formula,
Area of triangle = 
where s = 
s = 
= 21
Area of triangle = 
= 
= 21
cm2
( = 3.31)
= 69.65 cm2
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