exam Maths Puzzle Numerical Ability

Given: Ray AO is perpendicular to Ray CO
Prove: angle 1 and angle 3 are complementary angles
I have tried different things, but I do not understand this problem.

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If the sides of a square are decreased by 3 cm, the area is decreased by 81cm^2. What were the dimensions of the original square? suppose instead that the town experiences growth that can can be moldeled by the following:P=1000^t+P0 where t is the number of years from 2010.