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Asked by Girishdhawan | 25 Jun, 2018, 09:08: PM
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begin mathsize 16px style Take comma space straight x space equals space 11 cm comma space straight y space equals space 8 cm space comma space straight z space equals space 13 cm The space semi space perimeter space is space given space by comma space straight s space equals space fraction numerator straight x space plus space straight y space plus space straight z over denominator 2 end fraction equals space fraction numerator 11 space plus space 8 space plus space 13 over denominator 2 end fraction equals space 32 over 2 space equals space 16 cm The space area space of space the space triangle space is space given space by space Heron apostrophe straight s space formula comma Area space of space straight a space traingle space equals space square root of straight s space left parenthesis straight s space minus space straight a right parenthesis space left parenthesis space straight s space minus space straight b right parenthesis space left parenthesis space straight s space minus space straight c end root space space space space space space space space space space space space space space space space space space space space space space space space space space space equals square root of 16 space left parenthesis 16 space minus space 11 right parenthesis space left parenthesis space 16 space minus space 8 right parenthesis space left parenthesis space 16 space minus space 13 right parenthesis end root space space space space space space space space space space space space space space space space space space space space space space space space space space space equals square root of 16 space cross times space 5 space cross times space 8 space cross times 3 end root space space equals space square root of 1920 space equals space 8 square root of 30 space cm squared space space.... left parenthesis 1 right parenthesis Area space of space straight a space triangle space equals space 1 half space cross times space base space cross times space altitude rightwards double arrow space 8 square root of 30 space equals space 1 half space cross times space 13 space cross times space altitude rightwards double arrow altitude space equals fraction numerator 2 space cross times 8 square root of 30 space over denominator 13 end fraction space equals space fraction numerator 16 space cross times 5.4772 over denominator 13 end fraction space equals space 6.74 space cm end style
Answered by Yasmeen Khan | 26 Jun, 2018, 10:53: AM

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CBSE 9 - Maths
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CBSE 9 - Maths
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CBSE 9 - Maths
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