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Spring98

  • one year ago

Angle ABC is formed by segments AB and BC on the coordinate grid:

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  1. Spring98
    • one year ago
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    https://cv-kettle-falls.brainhoney.com/Resource/30603643,0/Assets/75195_53df876f/02_04_07.gif

  2. Spring98
    • one year ago
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    Angle ABC is rotated 90 degrees counterclockwise about the origin to form angle A'B'C'. Which statement shows the measure of angle A'B'C'? A. m∠A'B'C' = 90 degrees B. m∠A'B'C' = 180 degrees C. m∠A'B'C' = m∠ABC D. m∠A'B'C' = 2 ×m∠ABC

  3. Spring98
    • one year ago
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    @Michele_Laino can you help me?

  4. Michele_Laino
    • one year ago
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    a rotation around the origin of the whole cartesian plane doesn't affect the measure of the amplitude of an angle

  5. Spring98
    • one year ago
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    so how do i find my answer?

  6. Michele_Laino
    • one year ago
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    for example, after rotation, we have: point C goes to C'=(-2,3) point B goes to B'=(-3,5) point A goes to A'=(-4,3)

  7. Michele_Laino
    • one year ago
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    try to draw those new points A', B', and C' please

  8. Spring98
    • one year ago
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    okay hold on

  9. Spring98
    • one year ago
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    ok i did it on geogebra so what would the answer be @welshfella

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spraguer (Moderator)
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