Final answer:
The statement is true. The anterior and posterior body surface areas must be considered when estimating the extent of burns.
Step-by-step explanation:
The statement, 'The anterior and posterior body surface areas must be considered when estimating the extent of burns' is true.
When determining the size of a burn, the 'rule of nines' is used, which associates specific anatomical areas with a percentage of the body area affected. This takes into account both the anterior (front) and posterior (rear) areas of the body.
For example, if burns are present on both the front and back of the legs, the percentage of body area affected would be calculated for both the anterior and posterior surfaces of the legs.