81 is the only one.
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81 is the square root of 405. (81 x 5 = 405.)
sin(405) = square root of 2 divided by 2 which is about 0.7071067812
The perimeter of a rectangle cannot be calculated by just knowing the area unless the rectangle is a square. In which case the perimeter will be 4 x square root of the area.
GM of two numbers is the square root of their product, in this case sqrt 2025 ie 45.
No. It is an acute angle!