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A signboard pole OR is fixed upright at point O on a straight footpath ST. The two angles the pole makes with the footpath are equal because the pole is vertical.
What is the measure of each of these two angles?

Class 9Linear Pair and Vertically Opposite AnglesGeometry — Lines and Angles
  • A81
  • B180
  • C99
  • D90

Step-by-Step Solution

The two angles form a linear pair and are equal, so each = deg (the pole is perpendicular).
Answer: D) 90

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