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OpenStudy (anonymous):
Regular decagon ABCDEFGHIJ rotates 360° counterclockwise about its center. At which angle of rotation does A′ (the image of A) coincide with D? 36° 72° 108° 144°
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OpenStudy (yanasidlinskiy):
Welcome to OpenStudy! I think I know what your talking about....Is it this picture??
OpenStudy (anonymous):
Yes!
OpenStudy (yanasidlinskiy):
Sorry....you can't see it well...but.. We need to find what angle the vector A makes with the the vector D. the central angle subtended by each side is (360/10) the angle made by A' with vector D is 180-7*(360/10) since the rotation is counterclockwise the angle you are looking for is 360-(180-7*(360/10))
OpenStudy (anonymous):
So the answer is D?
OpenStudy (yanasidlinskiy):
Yup!:)
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OpenStudy (anonymous):
Thank you.
OpenStudy (yanasidlinskiy):
No problem!:)
OpenStudy (anonymous):
D is wrong
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