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How many triangles have three angles that are all perfect squares, when measured in degrees?
If you liked this problem, here is an NRICH task which challenges you to use similar mathematical ideas.
A woman was born in a year that was a square number, lived a square number of years and died in a year that was also a square number. When was she born?
How many four digit square numbers are composed of even numerals? What four digit square numbers can be reversed and become the square of another number?