Question

The angles of a quadrilateral are 90⁰, 80⁰ and 120⁰. Find the other angle?

Answer 1

Answer:

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

The sum of all angles of a quadrilateral is 360°

therefore 90+80+120+ other angle = 360°

other angle = 360°-290°

other angle = 70°

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