The radius of base of solid cone is 9 cm and its height is 21 cm. It cut into 3 parts by two cuts, which are parallel to its base. The cuts are at height of 7 cm and 14 cm from the base respectively. What is the ratio of curved surface areas of top, middle and bottom parts respectively?
A) 1 : 4 : 8 B) 1 : 3 : 5 C) 1 : 3 : 9 D) 1 : 6 : 12
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Step-by-step explanation:
Given
- The radius of base of solid cone is 9 cm and its height is 21 cm
- . It cut into 3 parts by two cuts, which are parallel to its base.
- The cuts are at height of 7 cm and 14 cm from the base respectively
Answer
- 1 : 3 : 9
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8
Step-by-step explanation:
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options A) 1:4:8 is a correct answer
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