A cuboid with a height of 40 cm and a cross-section is a cube. If the height is increased by 4 cm, the surface area will be increased by 80 square cm. Find the surface area of the original cuboid

A cuboid with a height of 40 cm and a cross-section is a cube. If the height is increased by 4 cm, the surface area will be increased by 80 square cm. Find the surface area of the original cuboid

80 △ 4 = 20 square centimeter
20 △ 4 = 5cm Side length of bottom surface
(5 × 5 + 5 × 40 + 5 × 40) × 2 = 850 (cm2)
This is according to the cuboid surface area calculation formula