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OpenStudy (mr.z):
Regular decagon ABCDEFGHIJ rotates 360° counterclockwise about its center. At which angle of rotation does A′ (the image of A) coincide with D? A. 36° B. 72° C. 108° D. 144°
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OpenStudy (mr.z):
Elsa213 (elsa213):
What do you think the answer is?
OpenStudy (welshfella):
if we draw lines from each of the 10 points on the decagon to the center we have 10 triangles
OpenStudy (welshfella):
the total of all the vertex angles of these triangles = 360 this will help you work it out.
OpenStudy (welshfella):
- image the wheel turning....
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