A 90-degree counterclockwise rotation involves turning an object or point 90 degrees to the left around a specified pivot point. For example, if you imagine a point on a Cartesian coordinate system, moving it 90 degrees counterclockwise would shift its position from, say, (1, 0) to (0, 1). This transformation effectively swaps the x and y coordinates and changes the sign of the new x-coordinate.
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It looks like (and is) a rectangle. All angles will be 90 degrees.
a L
The answer will depend on whether the rotation is clockwise or counterclockwise.
3 o'clock
You went 360o in the same direction, so you end up with a circle.