Question 192129
First, find the area of the triangle. 



{{{A=(bh)/2}}} Start with the area of a triangle formula



{{{A=(30*20)/2}}} Plug in b=30 and h=20



{{{A=600/2}}} Multiply



{{{A=300}}} Divide



So the area of the triangle is 300 square feet.




Now multiply the area of the rectangle by the cost per square foot to get: 


{{{300*3=900}}}



So it will cost a total of $900 to cover the triangular front with glass.