book Maths Puzzle Numerical Ability

How do you figure out that a angle is supplementary?

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Is there a specific formula to figuring out M2? For example: i have bedsheets and in my system is asking me to provide m2 How do I figure that out having only this number available i cannot figure this out, will somebody please show me how to do this...thanks so much!
Find the value of p if the line joining the points (3,-6) and (p,10) is perpendicular to th