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CBSE Class 9 Answered

Find the area of a triangle with perimeter 22 cm, one side 9 cm and difference of other two sides is 7 cm.
Asked by Topperlearning User | 21 Aug, 2017, 08:49: AM
answered-by-expert Expert Answer

Let a = 9

Now, a + b + c = 22

b + c = 22 - 9 = 13

b + c = 13           …(1)

Also, b - c = 7(given)… (2)

Adding (1) and (2) we get

2b = 20

Or, b = 10

From (1), c = 13 - 10 = 3.

Hence, a = 9, b = 10, c = 3 and s = 11

 

Answered by | 21 Aug, 2017, 10:49: AM

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