Mr.Z
  • 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°
Mathematics
schrodinger
  • schrodinger
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Mr.Z
  • Mr.Z
Elsa213
  • Elsa213
What do you think the answer is?
welshfella
  • welshfella
if we draw lines from each of the 10 points on the decagon to the center we have 10 triangles

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welshfella
  • welshfella
the total of all the vertex angles of these triangles = 360 this will help you work it out.
welshfella
  • welshfella
- image the wheel turning....

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