What is the area of a trapezoid with sides 4 cm and 5 cm and height 3 cm?

To find the area of a trapezoid, you use the formula: Area = (1/2) * (sum of parallel sides) * height. In this case, the sum of the parallel sides is 4 cm + 5 cm = 9 cm. Plugging in the values, we get: Area = (1/2) * 9 cm * 3 cm = 13.5 square cm. Therefore, the area of the trapezoid is 13.5 square cm.