Question

What is the angle of the rotation about C the maps the solid figure to the dashed figured?

tinypic(.)com/r/2utnvoo/9

Choices:
90° <<<< my answer
180°
270°
360°

Answer 1

@Sageee
Unlike certain sites, at OpenStudy, you don't have to hide a link. (.)
The question is very tricky because it does not mention the direction of rotation (clockwise or counter-clockwise (CCW)).
I do not know what your teacher/software assumes, but in trigonometry, the default is counter-clockwise.
Can you give me the complete answer, i.e. angle and direction, but I will let you choose the choices according to your teacher/software.

Answer 2

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