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CBSE Class 9 Answered

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Asked by Girishdhawan | 25 Jun, 2018, 09:05: PM
answered-by-expert Expert Answer
begin mathsize 16px style By space Heron apostrophe straight s space Formula comma
Area space of space straight a space triangle space equals space square root of straight s space left parenthesis space straight s space minus straight a right parenthesis space left parenthesis straight s space minus space straight b right parenthesis space left parenthesis space straight s minus straight c right parenthesis end root
Here space straight s space equals space fraction numerator straight a space plus space straight b space plus space straight c over denominator 2 end fraction space and space straight a space equals space 50 space straight m space comma space straight b space equals space 65 space straight m space and space straight c space equals space 65 space straight m
rightwards double arrow straight s space equals space fraction numerator 50 space plus space 65 space plus space 65 over denominator 2 end fraction space equals space 180 over 2 space equals space 90
rightwards double arrow Area space of space straight a space triangular space field space equals space square root of 90 space left parenthesis space 90 space minus 50 right parenthesis space left parenthesis 90 space minus space 65 right parenthesis left parenthesis 90 space minus space 65 right parenthesis space 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 space space space space space space space space space space space space equals square root of 90 space cross times 40 space cross times space 25 space cross times 25 end root space space space equals space square root of 2250000 space equals 1500 space straight m squared space
Cost space of space laying space grass space equals space Rs. space 5 divided by straight m squared space space space space
rightwards double arrow Total space Cost space equals space 1500 space cross times 5 space equals Rs. space 7500 space end style
Answered by Yasmeen Khan | 26 Jun, 2018, 11:42: AM
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