Class 9 Maths Question 6.
An isosceles triangle has perimeter 30 cm and each of the equal sides is 12 cm. Find the area of the triangle.
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Step-by-step explanation:
Two equal sides of an isosceles triangle 12 cm
Let one side be x
Perimeter of triangle = sum of all sides
30cm = ( 12 + 12 + x) cm
30cm = 24cm + x
30cm - 24cm = x
6cm = x
Non given side of triangle is 6cm
Area of triangle = 1/2 x b x h
= 1/2 x 6 x 12
= 3 x 12
= 36cm^2
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