The dimension of a rectangular base of a right pyramid is 9 cm by 5cm.
MATHEMATICS
WAEC 2020
The dimension of a rectangular base of a right pyramid is 9 cm by 5cm. If the volume of the pyramid is 105 cm3, how high is the pyramid?
- A. 10cm
- B. 6cm
- C. 8cm
- D. 7cm
Correct Answer: D. 7cm
Explanation
Volume = \(\frac{1}{3}\) x 9 x 5 x h
105 = \(\frac{1}{3}\) x 9 x 5 x h
\(\frac{105}{15} = \frac{15h}{15}\)
h = 7cm
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