exam Maths Puzzle Numerical Ability

Two angles are complementary. One angle is twice as large as the other angle. Find the measures of the angles.

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exam Other Question

I have a right triangle. a=2 and b=4 what does Cos(A)=?
I am having trouble with the problem. I know Cos(A)= b/c so i have to figure out what c= i believe? Thanks for the help. two angles are supplementary which equal 180 one angle has a measure that is five less than four times the other angle