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I think you can tell if a shape has a square corner by seeing if the corner has a 90 degree angle. If it is 90 degress than it is a square corner.
A trinomial is perfect square if it can be factored into the form
I think it depends on the context. Just two examples: You can tell someone to bring a bucket if you're going to the seaside, to make sandcastles. Or you can tell them to bring a bucket if they are about to experience something that may make them want to vomit...
1million square meters are in one square milometer. You can tell because of the prefix milo- in the word milometer.
You can tell whether a number is a square number by looking at the last digit. A perfect square number ends with either 1, 4, 5, 6, 9 or 00.