Spring98
  • Spring98
Angle ABC is formed by segments AB and BC on the coordinate grid:
Mathematics
katieb
  • katieb
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Spring98
  • Spring98
https://cv-kettle-falls.brainhoney.com/Resource/30603643,0/Assets/75195_53df876f/02_04_07.gif
Spring98
  • Spring98
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
Spring98
  • Spring98
@Michele_Laino can you help me?

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Michele_Laino
  • Michele_Laino
a rotation around the origin of the whole cartesian plane doesn't affect the measure of the amplitude of an angle
Spring98
  • Spring98
so how do i find my answer?
Michele_Laino
  • Michele_Laino
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)
Michele_Laino
  • Michele_Laino
try to draw those new points A', B', and C' please
Spring98
  • Spring98
okay hold on
Spring98
  • Spring98
ok i did it on geogebra so what would the answer be @welshfella

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