First, find the area of the triangluar shape. The formula for the area of a triangle, is:
[tex]A=\frac{1}{2}b\times h[/tex]Use b=30ft and h=20ft:
[tex]\begin{gathered} A=\frac{1}{2}(30ft)\times(20ft) \\ =300ft^2 \end{gathered}[/tex]Since the cost per square foot is $3, multiply 300 times 3 to find the total cost of the glass:
[tex]300\times3=900[/tex]Therefore, the cost will be $900.
