A frustum is made by removing a small square-based pyramid from a similar large squared-based pyramid as shown in the diagram. 15 cm 45 39 cm $13 Work out the total surface area of the frustum. Give your answer correct to the nearest whole number. 39 cm The height of the small pyramid is 15 cm. The height of the large pyramid is 45 cm. The square base of the large pyramid has side length 39 cm. 45 cm Diagram NOT accurately drawn