The area of a trapezoid is the formula h * (b1 + b2) / 2
h is height, which is 5 cm. base 1 and base 2 are 9.5 cm and 13.5 cm. Plug them in.
5 * (9.5 + 13.5) / 2
5 * 23 / 2
5 * 11.5
57.5 cm^2
