The figure below is a trapezoid, its area is unknown, the bottom 20 cm, there are two right angles, the other angle is 45 degrees

The figure below is a trapezoid, its area is unknown, the bottom 20 cm, there are two right angles, the other angle is 45 degrees

Make a vertical line along the opposite side of another angle to get an isosceles right triangle. If part of the lower base is equal to the height, the upper base is 20-16 = 4cm
(20 + 4) × 16 △ 2 = 192 square centimeter