1) Divide wall sections into the optimal number of panelling boards.
Specify board width, and your target/optimal overlap. Enter the total lengt of wall, and the app suggests the best measures to layou out the boards.
2) Calculate the amount of materials you need to e.g. cover a deck.
Spesify board width and area to be covered. App suggests meters of materials needed (incl. waste).
3) Enter two values, and calculate the rest of the sides and angles in a trigonometric calculator.