What is the smallest angle of rotational symmetry for a square?
Answer
A
45 degrees
B
90 degrees
C
180 degrees
D
360 degrees
Explanation
A square matches itself after a quarter-turn. Since a full turn is 360 degrees and 360 ÷ 4 = 90 degrees, its smallest angle of rotational symmetry is 90 degrees, choice D.
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