Question

the three angles of a quadrilateral are 60 80 and 120.find the fourth angle

Answer 1

Let the fourth angle be x
Now,
60°+80°+120°+x=360(Angle sum property of a quadrilateral)
x+260°=360°
x=360-260
x=100°

Answer 2

Answer:

100° is the fourth angle of the given quadrilateral  .

Step-by-step explanation:

Explanation:

Given , three angles of a quadrilateral are 60 °, 80° and 120°

Let fourth angle  of an quadrilateral be 'x' .

And we know that the sum of angle of a quadrilateral = 360°

Step 1:

Therefore , 60 + 80 + 120 + x = 360  

(sum of angles of a quadrilateral is equal to 360 °)

⇒260+  x = 360

⇒ x =  360 - 260 = 100

Final answer :

Hence , the fourth angle of the given quadrilateral is 100°

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