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A rectangle is 5cm long and 2cm wide. Take its long side as the axis, rotate it for a circle, and the figure is (), its ground diameter is () cm, and its height is () cm
Cylinder 4 5
A rectangle is 7cm in length and 5cm in width, which is rotated one circle around the length axis to form cylinder a, and rotated one circle around the width axis to form cylinder B. which is the larger and how much is the volume of cylinder a and cylinder B?
The volume of cylinder a: 3.14 × 52 × 7 = 3.14 × 25 × 7 = 549.5 (cm3), the volume of cylinder B: 3.14 × 72 × 5 = 3.14 × 49 × 5 = 769.3 (cm3), 769.3-549.5 = 174.8 (cm3) a: the volume of cylinder B is larger than that of cylinder a; 174.8 cm3 larger
A rectangle is 5cm in length and 2cm in width. A cylinder can be obtained by rotating a circle around the straight line where its length lies. What is the side area of the cylinder
What is the surface area
The bottom radius of the cylinder is 2 cm and the height is 5 cm;
Side area = bottom perimeter x height = 2x2x π X5 = 20 π (square centimeter) [about = 20x3.14 =...]
Surface area = side area + upper and lower bottom area = 20 π + 2x2x π x2 = 28 π (square centimeter) [about = 28x3.14 =...]
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