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Question

If the angle of vertex of an isosceles triangle is 100, then the measure of a base angle equals .
 
  1. 40
  2. 80
  3. 20


Solution

The correct option is A 40

Given that A=100
Since ABC is isosceles, we have ABC=ACB=x   (say)
Now, x+x+100=180   (Using angle sum property)
2x+100=180
2x=80x=40

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