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Серединные перпендикуляры к сторонам остроугольного треугольника ABC пересекаются в точке O. На стороне BC основанием серединного перпендикуляра является точка K. Известно, что OK = 9, KC = 12. Найдите AO.

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1 � Complete the text with the appropriate form of the verbs in brackets. I suppose that, in many ways, I 1 luwebee<c (be) lucky since the day I was born. I ��as born two months premature and I was very ill but somehow I 2 (survive). Then, when I was three, I 3 (fall) into a pond on a farm I 4 (stay) at. My mum 5 (go) into hospital for a� operation and some friends 6 (look after) me at the time. Luckily, a man � (work) near the pond and he $ (pull) me out! Nоw I'm in my last year at school and all my friends 9 (think} I'm very lucky. for exarnpte, I 10 (win) money o� the lottery four or five times and I usually 11 (beat) everybody at cards. I can't say I'm very hard-working but I 12 (do) well at exams —the right questions always come up. I'm also lucky i� love аnд I 13 (go out) with an amazing girl for the last six months. T hope my luck 14 (continue) in the future. I is (take) my university entrance exams in the summer and as soon as I 16 (finish} them, I �� (travel) for a couple of months. Then, hopefully, I 18 (study) architecture at university.