Question

three angles of a quadrilateral are equal if the fourth angle is 120° find the magnitude of each of the equal angles

Answer 1

Let the equal angle =x
Fourth angle=120
we know that Sum of internal angles of a quad =360
hence,,,x+x+x+120=360
3x=360-120
3x=240
x=240/3=80 hence all other three angles are 80 degree

Answer 2

Hi there USER!!!!

Here is your answer....

Let the 3 equal angles of the quadrilateral be x

Now, according to the angle sum property of quadrilateral the sum of all the interior angles of a quadrilateral is 360°.
ATQ,
x + x + x + 120° = 360°
3x = 360°-120°
3x = 240°
x = 240°/3
x = 80°

So the other three angles are of 80° .


Hope this helped you : )