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Question

If two angles of triangle measure 1000 and 400, then the third angle is ______.
  1. 20
  2. 30
  3. 40
  4. 50


Solution

The correct option is C 40
Sum of interior angles of any triangle is always 180
Given the angles are 100 and 40.
100 + 40 + x  = 180 
1400 + x = 1800 
x=180140x=40 

Hence, the third angle of the triangle is 40.

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