In the top part of the diagram, the trapezoid has bases A triangle with sides of lengths Using Heron’s formula to calculate the area: Both formulas express the same area, so: Without_loss_of_generality it is assumed that , thus the absolute value in the denominator does not appear in the calculation of height. ## Referenceshttp://www.murderousmaths.co.uk/books/trap.htm ## NotesJohn Blackburne, of Durham County, United Kingdom is convinced that the content of this post is not notable and does not belong on Wikipedia. If he’s wrong feel free to let him know. |

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