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What angle is a cube?
The measure of the angle of a cube is pi/2 steradians.
How many angle and side do cube have?
8side and 6angle
What construction was never accomplished by the Greeks?
Doubling a cube Trisecting any angle
How do you cube the square root of imaginary number ex square root of 2i cubed?
From the question, it seems you already calculated the square root, or know how to get it. You can cube complex numbers just like you cube normal numbers: multiply them by themselves; the number must appear three times as a factor. For example, the cube of (2 + i) is (2+i) x (2+i) x (2+i). Another method - usually faster - to calculate any power is to express the complex number in polar form (absolute value and angle). For the specific case of a cube, the cube of such a number is the cube of the absolute value, at an angle that is three times the angle of the original number.
What Greek constructions were never accomplished with only a straightedge and a compass?
Doubling a cube and trisecting any angle
