The linear equation 3x-11y=20 is
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Let x be one the three equal angles.
Sum of all the angles of a quadrilateral = 360o
⇒ x + x + x + 120o = 360o
⇒ 3x = 360o -120o
⇒ 3x = 240o
⇒ x = 80o
Thus, the measure of each of the equal angle is 80o
Step-by-step explanation:
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