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On one side of a transversal, the two interior angles are 120° and 70°.
By how many degrees does their sum exceed 180°?

Class 9The Fifth PostulateGeometry — Foundations
  • A10
  • B9
  • C20
  • D11

Step-by-Step Solution

Sum = 120 + 70 = 190°, which exceeds 180 by 190 - 180 = 10°. Since 190 > 180, the lines do NOT meet on this side (they meet on the opposite side). The required amount is 10.
Answer: A) 10

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