i got the answer to be 102.6 metres.
First you had ti find the distance PT (using pythagoras with the other two sides) which equalled 2050. Then I 'looked' from above, and drew a diagram of an isosceles triangle with height PT and base 2r. Because of the line down the middle, you have two...
Mhhmmmmhm
Actually, scrap my last post, i was the same as sonjay.
I finished the exam with an hour to spare, so i went over a re-wrote the entire exam as neat as i could for the markers.
No wait... i actually finished with two hours to spare! i quadrouple checked the answers and worked out...
Mmmmmmhmmmm
My eyes got sore at the end. I reached the limit of what i could do with 10 minutes left!! how bad is that? I was too stuffed to get anywhere with queson 8 or 6... so i barely did anything. Then i got out, looked at the paper and realised i missed a page in question 5.... pity
I...