Question

If the three angles of a quadrilateral of 50 degree,70 degree,120 degree find the forth angle.

Answer 1

We know that the sum of all the angles of a quadrilateral is 360° .

According to the question,

Assume x as the fourth angle, so that

50° + 70° + 120° + x = 360°

or, 240° + x = 360°

or, x = 360° - 240°

or, x = 120°

Answer:

The measure of the fourth angle is 120° .

Answer 2

Answer:

The three angles of the quadrilateral are 50 degree,70 degree and 120 degree.

Let the fourth angle be x.

Since, The sum of the angles of a quadrilateral is 360°, therefore

Step-by-step explanation:

50°+70°+120°+x = 360° [Angle sum prop. of a quadrilateral]

240°+x =360°

x= 360°-240°= 120°.

So the answer is 120°. ( >o< )