Question

what is the area of the wall that will be painted green? ft²

Explanation:

Step1: Recall the formula for the area of a triangle

The formula for the area of a triangle is \(A=\frac{1}{2}\times base\times height\).

Step2: Identify the base and height of the green - painted triangular region

The base of the triangle is \(b = 12\) ft and the height of the triangle is \(h=3\) ft.

Step3: Calculate the area of the green - painted region

Substitute \(b = 12\) and \(h = 3\) into the formula \(A=\frac{1}{2}\times base\times height\).

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Answer:

\(18\)