A perpendicular AD is drawn on BC from the vertex A of the acute `Delta ABC`. Prove that
Channel: Doubtnut
Date: 2020-05-09

A perpendicular AD is drawn on BC from the vertex A of the acute `Delta ABC`. Prove that `AC^(2) = AB^(2) +BC^(2) -2BC.BD`   OR  Prove that the square drawn on the opposite side of theacute angle of an acute triangle is equal to the areas of the sum of the squares drawn on its other two sides being subtracted by twice the area of the rectangle formed  by one of its sides and the projection of the other side to this side.