Площадь крыши

In this calculator to calculate the area of ​​the roof consists of the following calculations:
- Calculation of the gable roof
- calculation of the hip roof
- calculation of the gambrel roof
- calculation of the pent roof
Each collected calculating the minimum number of unknown quantities to get the exact value of the square.
When calculating a gable roof - is the size in terms of the house, the height up to the ridge and roof overhangs on both sides.
When calculating the hipped roof - these are the same size in terms of height to the top and roof overhangs.
When calculating the gambrel roof - is the size of the house in terms of height to the ridge, the distance from the wall to the rack and roof overhangs.
When calculating the pent roof - the dimensions in plan, elevation change from one wall to the other and then again roof overhangs.