A man stands 9 metres from the base of a tree. He knows the distance from where he is standing and the top of the tree is 15 metres. How tall is the tree?
a2 + b2 = c2
a : 9 b : unknown c: 15
b2 =c2 - a2
so b2 = 225 - 81
=144 so b=12
JM
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