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Any quadrilateral can be split into 2 scalene triangles then adding them you get the area quad.
The triangles formed can either be scalene or equilateral or isosceles or right triangle, accordingly the formula changes.

SCALENE triangle:-
√s(s-a)(s-b)(s-c) + √s(s-a)(s-b)(s-c)

Equilateral triangle:-
√3 /4 a²+√3/4a²

Isoceles triangle;-

Right triangle:-
√(a²+b²) + √(a²+b²)

Thank You........!!!!!
Mark as brainliest if helpful....
Yours, Jahnavi
2 5 2
:-) was it helpfull??
yes ofcourse
Then ur at most welcome sweety sis
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