The diagram shows a cube - Edexcel - GCSE Maths - Question 19 - 2020 - Paper 3

To find the lower bound of AH, we need to account for the rounding. Since AH is given as 11.3 cm to the nearest millimeter:

• The lower bound will be slightly less than 11.3 cm.
• The nearest mm means the value could be as low as 11.25 cm.

Thus, the lower bound for AH is:

$11.3 - 0.05 = 11.25 ext{ cm}$.

The cube's edges are equal to the length of AH, so the lower bound of each edge of the cube is also 11.25 cm.