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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exam Other Question
choosing a local phone number if the exchange is 234 and each of the four remaining digits is different. Graph: f(x) = 2x + 2.


Thanks for any help you can provide.