Shape and Space 9

3 marks · Easy

The table below shows the lengths (in cm) of the edges of three different cuboids.

Edge lengths of cuboids (in cm)
Cuboid	Length	Width	Height
A	4	3	9
B	6	5	2
C	8	7	3

Work out the length of the longest space diagonal for each cuboid, giving your answers to 1 decimal place.

Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.

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Must show: Correct calculation for each cuboid

Common mistakes: Forgetting to square all three dimensions; Incorrect rounding

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Marking points

A1 · 1 mark · Cuboid A correct diagonal, 10.1 cm

A2 · 1 mark · Cuboid B correct diagonal, 8.4 cm

A3 · 1 mark · Cuboid C correct diagonal, 11.1 cm

Worked solution