MHB Need Help with finding the area of this figure

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To find the area of a figure without using software like Geogebra, one can use the formula for quadrilaterals with perpendicular diagonals, which is area = (1/2) * d1 * d2. A specific example provided calculates the area of a rectangle as 15 square units using the dimensions 5 and 3. The discussion emphasizes the importance of knowing the appropriate equations for different shapes. Understanding these formulas can simplify area calculations significantly.
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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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