In this question, you are given the boar length (30.5cm), width(8.8cm) and height(1.8cm). To answer this question, you need to know the formula needed to count volume. Volume is length x width x height. Since all the dimension is in the same unit (all in cm) you don't need to convert them.
The calculation would be: 30.5cm x 8.8cm x 1.8cm =483.12cm cubic