The point with coordinates (p, q) will be rotated to the point with coordinates [(p - q)/sqrt(2), (p + q)/sqrt(2)].
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An acute angle.
8 because there are 180 degrees in a triangle and 8*180 = 1440 degrees The interior angles of a 10 sided shape add up to 1440 degrees
An angle in a four sided shape can have any measure in the interval (0, 360) degrees except 180 degrees.
1260
Hendecagon