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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...