\[A=\frac{1}{2}bh\]
Why It Works
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Why It Works for Right Triangles

The base of the rectangle is 5 units.
The height of the rectangle is 3 units.
The area of the rectangle is \((5 \, in)(3 \, in)=15\, in^2\).
The hypotenuse of the triangle
Why It Works for Acute Triangles

Why It Works for Obtuse Triangles
