Its an agreement. Like if someone would ask "Could you buy milk on your way home?" then someone could respond with "Sure thing." to show they will do what you asked.
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They both mean the same thing.
Not sure what you mean, but for one thing, it equals 43.75 square miles.
The word certain means that it is going to happen; it is 100% likely; a sure thing.
sure as in "a sure thing" or "Are you sure?" or "Yes, I'm sure"
i am very sorry but i am not sure what you mean i just thing a pyramid has equal sides