QuestionUsing Pythagoras' theorem, calculate the length of PR. Give your answer in centimetres (cm) and give any decimal answers to 1 d .p.
Not drawn accurately

Studdy Solution
Calculate the length of PR by taking the square root of $PR^2$: $$PR = \sqrt{441}$$ $$PR = 21$$
Since the result is a whole number, no rounding is needed.
The length of PR is:
$$\boxed{21 \text{ cm}}$$