if tangent of (m∠BCA) = (distance AB) / (distance BC), then tangent of (m∠BCA) = (distance BA) / (distance CB)

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• tangent of (m∠BCA) = (distance BA) / (distance CB),

  if the following are true:

  • a = b
  • b = c

  then a = c

  • tangent of (m∠BCA) = (distance AB) / (distance BC)
  • (distance AB) / (distance BC) = (distance BA) / (distance CB), (distance AB) / (distance CD) = (distance BA) / (distance DC)