29
QuizMultiple Choice

Rotations — Quiz

Question 29 • Mathematics I

For the transformation to be defined as a rotation, which statements must be true? Choose three correct answers.

Answer
A
The segment connecting the center of rotation, cap c , to a point on the pre-image (figure 1 ) is equal in length to the segment that connects the center of rotation to its corresponding point on the image (figure 2 ).
B
The transformation is rigid.
C
Every point on figure 1 moves through the same angle of rotation about the center of rotation, cap c , to create figure 2 .
D
Segment CP is parallel to segment CP prime .
E
If figure 1 is rotated 180 degrees about point cap c , it will be mapped onto itself.

Explanation

A rotation preserves the distance from the center of rotation to every point, so the segment lengths in A are equal. It is a rigid transformation, meaning it preserves lengths and angle measures, as stated in B. Every point turns through the same angle around the center, which is the defining motion described in C. A rotation does not generally make CP parallel to CP′ or map a figure onto itself after a 180-degree turn.

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