The area of the new trapezoid is increased by 76 square centimeter if the bottom is lengthened by 1 / 4 and the height and upper bottom remain unchanged

The area of the new trapezoid is increased by 76 square centimeter if the bottom is lengthened by 1 / 4 and the height and upper bottom remain unchanged

The increased area = the increased length of the bottom × height △ 2
Substituting the numerical value, we get
32 / 4 × h △ 2 = 76
The solution is high = 19
Original trapezoid area = (20 + 32) × 19 △ 2 = 494cm2