###$$$$ Area of a Triangle Formula

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