The radius of the bottom surface of the metal cylinder is
20 ÷ 2 = 10 cm
The volume of the metal cylinder is
10×10× 3.14×10 = 3140 cubic centimeters.
The radius of the bottom surface of the cylindrical water tank is
40 ÷ 2 = 20 cm
The bottom area of cylindrical storage tank is
20× 20× 3. 14 = 1256 cm2
The water level in the sink will rise.
3 140/ 1256 = 2.5cm。
2. Dig a cylindrical pool, and measure the bottom circumference of 3 1.4m and the depth of 2.4m from the inside. How many square meters is its inner wall and bottom covered with cement? How many tons of water can this pool hold? (There is no water weight of one cubic meter 1 ton)
The bottom radius is
31.4÷ 3.14÷ 2 = 5m.
The bottom area is
5× 5× 3. 14 = 78.5 square meters
The transverse area is
3 1.4× 2.4 = 75.36 square meters
The area covered by cement is
78.5+75.36 = 153.86 m2
This pool can hold water.
78.5× 2.4× 1 = 188.4 tons