The top of a trapezoid is a centimeter, the bottom is B centimeter, and the height is h centimeter. Its area is () square centimeter. If a = B, then the figure becomes( Shape, area (). If a = 0, then the shape becomes () shape, area ()

The top of a trapezoid is a centimeter, the bottom is B centimeter, and the height is h centimeter. Its area is () square centimeter. If a = B, then the figure becomes( Shape, area (). If a = 0, then the shape becomes () shape, area ()

The area of a trapezoid is (a + b) H / 2 square centimeter. If a = B, then the figure becomes (parallelogram) with an area of (ah) square centimeter. If a = 0, then the figure becomes (triangle) with an area of (BH / 2) square centimeter