The mathematical term 'perfect square' means that a number, which has a rational number as its square root. 25 is a perfect square, because its square root is 5, a rational number.
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1st term is a perfect square 3rd term is a perfect square square root of 1st and 3rd term multiplied together then multiplied again by 2 to get the middle term
The mathematical term for "mean" is "mean".The popular, or colloquial term for "mean" is "average".
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Mean is the mathematical term for average.