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What is the greatest common factor of 8 and 36

Astick 2 m long is placed vertically at point b. the top of the stick is in line with the top of a tree as seen from point a, which is 3 m from the stick and 30 m from the tree. how tall is the tree?

The perimeter of a quarter circle is 14.28 miles. what is the quarter circle's radius?