Question

If a quadrilateral has three angle 100° , 80° , 60° , then 4th angle is equal to​

Answer 1

Answer:

4th angle 120 hoga

Step-by-step explanation:

100+80+60+ x= 360

240+x = 360

x= 360-240

x= 120

Answer 2

Answer:

120

Step-by-step explanation:

The sum of all interior angles of a quadrilateral is 360. .

let the unknown angle be x

so

x+100+80+60=360

x+240=360

x=120

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