Angles and coordinates

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Angles and coordinates

• AB is a straight line.
• ?BAC is an acute angle.
• Jot down the coordinatesof a new position for C
  so that ?BAC is an acute angle.
• Try to find simple rules,which by comparing
  thecoordinates of A and Cyou can tell straight
  awaywhether ?BAC isan acute, obtuse, reflex or
  right angle.