The aquarium has the shape of a rectangular parallelepiped. Its side walls are glass.

The aquarium has the shape of a rectangular parallelepiped. Its side walls are glass. Determine the surface area of the glass if the aquarium is 50 cm long, 25 cm wide, and 30 cm high.

Action decision:
1) 50 * 25 = 1250 (cm sq) – base area
2) 2 (50 + 25) = 150 (cm sq) – base perimeter
3) 150 * 30 = 4500 (cm sq) – the product of the base perimeter and the height, i.e. lateral surface area
4) 1250 + 4500 = 5750 (cm sq) – glass surface area
S = 50 * 25 + 2 (25 * 30 + 50 * 30) = 1250+ 2 (750 + 1500) = 1250 + 2 * 2250 = 5750 (cm sq)
Answer: the surface area of the glass is 5750 cm square.