A prism and a pyramid have the same base area and the same height. What is the ratio of the volume of the prism to that of the pyramid?

Difficulty: Easy

Correct Answer: 3 : 1

Explanation:


Introduction / Context:
Comparing volumes of solids with the same base and height is a classic geometry result. Pyramids (including cones) have one-third the volume of the corresponding prism (or cylinder) with equal base and height.


Given Data / Assumptions:

  • Same base area B and same height H.


Concept / Approach:
Volume formulas: V_prism = B * H; V_pyramid = (1/3) * B * H. Take their ratio.


Step-by-Step Solution:

V_prism / V_pyramid = (B*H) / [(1/3)B*H] = 3Therefore, ratio = 3 : 1


Verification / Alternative check:
Analogy: Cylinder vs cone with same base and height also yields 3:1 for volumes.


Why Other Options Are Wrong:

  • 1:1 and 1:3 contradict the standard formula.
  • Cannot be determined: Sufficient information is provided via general formulas.


Common Pitfalls:
Mixing up the factor 1/3 for pyramids and cones; thinking perimeter rather than area influences the ratio.


Final Answer:
3 : 1

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