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Find the area of an isosceles …

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Find the area of an isosceles triangle each of whose equal sides measures 13 cm and whose base measures 20 cm. in class 9 in RS Agarwal book chap 14

Posted by Nitin Mishra 9 months ago

CBSE > Class 09 > Mathematics

1 answers

Manshu Singh 9 months ago

We have, Area of a triangle by heron's formula= √s(s-a)(s-b) (s-c) Now we know, s = perimeter of triangle/2 So, s=13+13+20/2=23 Let, put the value of s in formula =√23(23-13) (23-13) (23-20) =√23*10*10*3 =√23*2*5*2*5*3 Area = 10√69 cm square

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CBSE > Class 09 > Mathematics