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General Mathematics Paper 2,May/June. 2009  
Questions: 1 2 3 4 5 6 7 8 9 10 11 12 13 Main
General Comments
Weakness/Remedies
Strength








Question 5

In the diagram, ABCDEF is a triangular prism. <ABC = <DEF = 90°, /AB/ = 24cm, /BC/ = 7cm and /CD/ = 40cm.Calculate:

(a) /AC/;

(b)The total surface area of the prism.

 

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Observation

Answering the question required the basic idea of areas of  plane/compound shapes. Many candidates could not identify the various faces of the prism hence could not solve the problem. The prism had 3 rectangular faces and 2 triangular faces. Candidates were to find the areas of the respective faces and add them together to get the required surface area = 2408cm2. Some candidates viewed the prism as having only 4 faces and hence could not get the correct answer.

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