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Question

A circle is divided into 80 equal parts, then the angle between any two alternate radii is______ degrees.
  1. 9


Solution

The correct option is A 9
If a circle is divided into 80 equal parts, then the angle between two adjacent radii is 36080 i.e 4.5 degrees.
The angle between two alternate radii is 2×4.5 i.e 9 degrees.

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