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OpenStudy (anonymous):
Help please? Regular pentagon ABCDE rotates counterclockwise about its center to yield pentagon A'B'C'D'E'. At which angle of rotation does A' coincide with D?
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OpenStudy (anonymous):
|dw:1459616532890:dw|
OpenStudy (anonymous):
320° 288° 216° 144° 72° I think it is 72 but I am not sure
OpenStudy (anonymous):
@Janu16 do you mind checking my answer?
OpenStudy (welshfella):
Hint: a --->b' = 72 degrees
OpenStudy (anonymous):
3 x 72 = 216
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OpenStudy (anonymous):
@welshfella Oh... so 216?
OpenStudy (anonymous):
that's the answer
OpenStudy (welshfella):
right
OpenStudy (anonymous):
@welshfella @Joshtray Thank you so much!
OpenStudy (welshfella):
can you see why?
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OpenStudy (welshfella):
yw
OpenStudy (anonymous):
welcm
OpenStudy (anonymous):
Because 360 degrees and the origin divided by 5 are 72? and 72 x 5 is 126
OpenStudy (welshfella):
72 * 3 = 216 you mean...
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