SSC CGL 6 Aug 2017 Shift 1 Paper

Question : 72 of 100

Marks: +1, -0

The two equal sides of an isosceles triangle is 20 cm each and the third side is 30 cm. What is the area (in cm

^{2}

) of the triangle?

Solution:

Area of isosceles triangle

= 1/4 b√{4a^2 - b^2}

1/4 × 30√{4× (20)^2-(30)^2}

15/2× √{1600-900}

15/2× √700={15× 10√7}/2

=75√7\cm^2

Go to Question:

Prev Question

Next Question