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CBSE Class 9 Answered

Find the area of a triangle whose sides are 6.5 cm, 7 cm and 7.5 cm.
Asked by Topperlearning User | 28 Aug, 2017, 02:45: PM
answered-by-expert Expert Answer

Here, P = 6.5 + 7 + 7.5 = 21 cm

begin mathsize 12px style straight S equals fraction numerator straight a plus straight b plus straight c over denominator 2 end fraction end style

So, s = begin mathsize 12px style 21 over 2 end style= 10.5 cm

s - a = 4, s - b = 3.5, s - c = 3

Area of triangle = begin mathsize 12px style square root of straight S open parentheses straight S minus straight a close parentheses open parentheses straight S minus straight b close parentheses open parentheses straight S minus straight c close parentheses end root end style


 Δ= 21 cm2

Answered by | 28 Aug, 2017, 04:45: PM
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