This is how to calculate the area of a flat roof.
Flat RoofFlat Roof
TOTAL ROOF AREA      
Last shape:
Last area: 		     Divide the roof into simple geometric shapes. Then add or subtract the area of each geometriic shape. This calculator does the work. Just enter the required dimensions.
a =  b =    
a =  b =    
a =  b =  
a =  b =   c =  
d =  
   The quantity of roofing material will exceed the area of the roof due to waste. This varies based on the complexity of the roof from 10 to 15%.
   The removal of roofing material may damage landscaping. An allowance might be added for that.
Add a rectangle. Subtract area of a rectangle. Enter area of the selected shape. Clear total. Clear current entry. Enter the area of the selected shape. Add a triangle. Subtract area of a triangle. Add the area of a parallelogram. Subtract the area of a parallelogram. Add the area of a trapezoid. Subtract the area of a trapezoid. Add the area of a circle. Subtract the area of a circle.
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