Question

Find the area of quadrilateral ABCD in Which AB=7cm,BC=6cm,CD=12cm,DA=15cm,AC=9cm.

Answer 1

Area of trianlge= sqrt(s(s-a)(s-b)(s-c)) 
FOR area of triangle ABC 
s=(7+6+9)/2=11 
area of triangle ABC=sqrt(11(11-7)(11-6)(11-9)) 
=sqrt(440) 
= 20.9761 
similarly, 
area of triangle ADC=54 

therefore area of quadrilateral ABCD=20.9761+ 54 
=74.9761

Answer 2

first we find it hypotan
then using herons formula in both triangle
then add area of both triangle
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