Jayden is planning a concert and needs to tell the bands that are playing how big the stage is. The stage has a width of 21 feet and a depth of 16 feet. What is the area of the triangular stage below, in square feet? Remember, the formula for the area of a triangle is where represents the length of the base of the triangle and represents its height. A triangle with a base labeled with the word, width, and the height labeled with the word, depth.