A bathroom is 2.4 meters long and 1.8 meters wide. How many square meters does it cover?

2.4 * 1.8 = 4.32 square, independent of height

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1. The height of a cylindrical carton is 15cm. If the height is reduced by 2cm, the surface area will be reduced by 188.4cm I learned 188.4 △ 2 = 94.2 (CM) 94.2 △ 3.14 △ 2 = 15 (CM) 15 × 15 × 3.14 = 706.5 (square cm) 94.2 × 15 = 1413 (square cm) 706.5 × 2 + 1413 = 2826 (square cm)
2. A cylindrical carton is 15 cm high. If the height is reduced by 2 cm, the surface area will be reduced by 188.4 square cm
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