Q3 of 50 Page 12

Find the area of an isosceles triangle having the base x cm and one side y cm.


In ∆ABC, AB = ………………….Given


Since , and are the sides of an isosceles triangle and s is


the semi-perimeter, then its area is given by:


A = where [Heron’s Formula]


=


A=


A = = cm2


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1

Find the area of a triangle whose base and altitude are 5 cm and 4 cm respectively.

 2

Find the area of a triangle whose sides are 3 cm, 4 cm, and 5 cm respectively.

 4

Find the area of an equilateral triangle having each side 4 cm.

 5

Find the area of an equilateral triangle having each side x cm.