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Question

Match the figures with their respective unknown angles.

A
80
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B
100
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C
40
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Solution

  • The sum of all interior angles of a triangle is 180.
So, X=180(40+60)=80

  • The exterior angle is equal to the sum of opposite interior angles.
So, X=40+60=100
  • The angles opposite to the equal sides of an isosceles triangle are equal.
So, X=40



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