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Mr.Z

  • one year ago

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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  1. Mr.Z
    • one year ago
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  2. Elsa213
    • one year ago
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    What do you think the answer is?

  3. welshfella
    • one year ago
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    if we draw lines from each of the 10 points on the decagon to the center we have 10 triangles

  4. welshfella
    • one year ago
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    the total of all the vertex angles of these triangles = 360 this will help you work it out.

  5. welshfella
    • one year ago
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    - image the wheel turning....

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