RS Aggarwal & V Aggarwal - Mathematics

Book: RS Aggarwal & V Aggarwal - Mathematics

Chapter: 7. Areas

Subject: Mathematics - Class 9th

Q. No. 10 of Exercise 7A

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10

The base of an isosceles triangle measures 80cm and its area is 360cm2 . Find the perimeter of the triangle.

Let us assume be an isosceles triangle and let AL perpendicular BC



It is given that,


BC = 80 cm


Area of triangle ABC = 360 cm2


We know that,


Area of triangle =


= 360 cm2


= 360 cm2


= 360 cm2


=


= 9 cm


Now,


BL =


= (


= 40 cm


a =


=


=


=


= 41 cm


Therefore,


Perimeter of the triangle = (41 + 41 + 80) = 162 cm


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