MHB Need Help with finding the area of this figure

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If u know a equation for finding the area please submit it.
Or a way to do it without using a program such as "Geogebra".

Thanks in advance.
 

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$5\cdot3=15\text{ sq. units}$.
 
Any quadrilateral whose diagonals $$d_1$$ and $$d_2$$ are perpendicular will have area equal to $$\dfrac{1}{2}d_1d_2$$.
 

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