2024 GESS PRELIMS P1 Q11

2024 GESS PRELIMS P1 Q11

6 marks

The diagram shows a prism in which its cross-section is a regular hexagon of side \( \left(5 + \sqrt{3} \right)\) cm.

  1. Find an expression for the cross-sectional area of the prism in the form \(q\sqrt{3} + p\) cm\(^2\), where \(p\) and \(q\) are integers.[3]
  2. Given that the volume of the prism is \(3 \left(32\sqrt{3} + 138 \right)\) cm\(^3\), find the height of the prism in the form \( \left(a\sqrt{3} + b \right)\) cm, where \(a\) and \(b\) are integers.[3]

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Answer:(a) \((42\sqrt3+45)\text{ cm}^2\), so \(q=42\), \(p=45\) (b) \((4\sqrt3-2)\text{ cm}\), so \(a=4\), \(b=-2\)

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