Three angles of a quadrilateral are equal and fourth one is 120°. Find the measure of these 3 equal angles of the quadrilateral.
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Answered by
1
Answer:
80 degree
Step-by-step explanation:
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
Answered by
0
Step-by-step explanation:
let sum of all the angles which are equal be - X
In a quadrilateral,
sum of all four angles is 360 degree
(name four angles as 1, ,2, 3 and 4)
1+2+3+4= 360
x + x + x + 120 = 360
3x = 360 - 120
3x = 240
x = 240÷3
x = 80
Therefore the angles which are equal to one another is of 80 degrees each..
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