Question
An isosceles triangle has perimeter 30 cm and each of the equal sides is 12 cm. Find the area of the triangle.
Solution
a = 12 cm
b = 12 cm
Perimeter = 30 cm
⇒ a + b + c = 30
⇒ 12 + 12 + c = 30
⇒ 24 + c = 30
⇒ c = 30 – 24
⇒ c = 6 cm
Area of the triangle
