RS Aggarwal & V Aggarwal - Mathematics

Book: RS Aggarwal & V Aggarwal - Mathematics

Chapter: 7. Areas

Subject: Mathematics - Class 9th

Q. No. 9 of Exercise 7A

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9

Find the area of an isosceles triangle each of whose equal sides measures 13cm and whose base measures 20cm.

Let,


a = 13 cm


b = 13 cm


And,


C = 20 cm


Now,


s =


=


= = 23 cm


We know that,


Area of triangle =


=


=


= 10


= 10 × 8.306


= 83.06 cm2


Therefore,


Area of isosceles triangle = 83.06 cm2


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