Refer to the equilateral triangle shown below and its six symmetries: ? r1 : reflection with axis l1 ? r2 : reflection with axis l2 ? r3 : reflection with axis l3 ? R1 : 120° clockwise rotation with rotocenter O ? R2 : 240° clockwise rotation with rotocenter O ? I : the identity symmetry
Which symmetry results when applying the symmetry R2 followed by r1 ?
A. R1
B. r1
C. R2
D. r2
E. r3
Answer: D
Mathematics
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?
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?
__________°
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