Answers

2016-04-24T20:23:38+05:30
Here at first quadrilateral has to be divided into into parts we get abc tringle and acd triangle
later mark its abc three sides
use herons formula
√s(s-a)+(s-b)+(s-c)
whre s= a+b+c/2
first triangle
a=120;b=60;c=140(diagonal)
s=120+30+140/2
=145
√145(145-120)+(145-30)+(145-140)
√145(25)+(115)+(5)
√145(145)
area of 1st traingle=145
Area of 2nd triangle
here a=80;b=100;c=140
same as before we do
we get following ans 
s=160
by herons formula
area =160
ADD BOTH AREAS 
140+160 =300
therefor area of quadrilateral is 300sq.cm

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