Question

find the unknown variables​

Answer 1

y = 180 - (50 + 90) [Angle sum property]

y = 180 - 140

y = 40°

Answer 2

Answer:

Let angles be XYZ. Then, X = 50 (given)

Y = Unknown

Z= Unknown

Now,

Z = 90° as the sign used there resembles a right angle.

Using angle sum property

X+Y+Z = 180°

50 + y + 90 = 180

y + 140 = 180

y = 180 - 140

y = 40 °