alleryTurn an equilateral triangle about its center; it first looks unchanged after how many degrees?
A60 degrees
B180 degrees
C90 degrees
D120 degrees
Answer & Solution
Correct answer: D. 120 degrees
1. An equilateral triangle has 3 identical corners around its center.
2. A full turn is 360 degrees.
3. The smallest turn that brings it onto itself is 360 / 3 = 120 degrees.
_Source: Wikipedia, Rotational symmetry (CC BY-SA 4.0), Rotational symmetry_
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