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Xiaohong's family wants to make a cuboid open glass fish tank that is 70cm long, 50cm wide and 65cm high (glass thickness is ignored) 1. Please help Xiao Hong calculate how many square decimeters of glass is needed to make this fish tank? 2. Pour some water into the fish tank. The height of the water is 25cm from the mouth of the fish tank. How many liters of water are poured into the fish tank? 3. When some small stones are put into the fish tank, the water surface rises by 10 cm. What is the volume of small stones in cubic decimeters? 4. How many centimeters of colored light line is needed to surround the upper edge of the fish tank with a circle of colored light line? If you have a good answer, you can add extra points!
Xiaohong's family wants to make a cuboid fish tank without cover, which is 70cm long, 50cm wide and 65cm high (the glass thickness is ignored). 1. Please help Xiaohong to calculate how many square decimeters of glass is needed to make the fish tank? 70 * 50 + (70 + 50) * 2 * 65 = 19100 square centimeters = 191 square decimeters. 2. Pour some water into the fish tank
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