Find the ratio between whole surfaces of a sphere and a hemisphere?
Correct answer: B. 4:3
- A. 3:4
- B. 4:3
- C. 3:1
- D. 1:3Everyday Science Quiz
Explanation
The whole surface area of a sphere is 4pi r2, while the total surface area of a hemisphere, including its circular base, is 3pi r2. Therefore the ratio is 4pi r2:3pi r2 = 4:3. Students may choose 3:1, option c, by comparing only the curved surface of the hemisphere with its base or using an incomplete surface formula.
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About Area and Volume
Area measures the surface enclosed by two-dimensional figures, while volume measures the space occupied by three-dimensional solids. Problems use formulas for rectangles, triangles, circles, prisms, cylinders, cones, spheres, and composite figures, including unit conversion and the distinction between surface area, lateral area, and volume.
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