Question

1) Find the Rotational angle:
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Answer 1

The point of rotation is the origin, draw lines joining one of the points, say X and it's image to the origin.

You can see that the lines form an angle of 270° , in the counterclockwise direction.

Therefore, ΔX'Y'Z' is obtained by rotating ΔXYZ counterclockwise by 270° about the origin.

So, the correct choice is C