The height of a pyramid on square base is 15cm. If the volume is 80cm...
MATHEMATICS
WAEC 1999
The height of a pyramid on square base is 15cm. If the volume is 80cm3, find the length of the side of the base
- A. 3.3cm
- B. 5.3cm
- C. 4.0cm
- D. 8.0cm
Correct Answer: C. 4.0cm
Explanation
Volume = \(\frac{1}{3} b^2 h\)
\(\therefore b = \sqrt{\frac{3v}{h}}\)
\(b = \sqrt{\frac{3(80)}{15}} \)
\(b = \sqrt{16} = 4.0 cm\)
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