For part (i), use Pythagoras theorem to get QU. Then, add all the sides together.

If you still don't understand, please ask :)

But also cannot

Find UT first using Pythagoras theorem, then take PT - UT = PU.
Now find QU using Pythagoras theorem again.

Sorry, I didn't see your comment. If you still need help for this question I can do it up.

thankyou，After the question ii)? I don't know the formula

Do you want me to do up the question for you?

Ya