Find the value of the unknown angle X. 158°
51°
21°
The diagram is not drawn to scale.
O
2 =
O

x =

Step-by-step explanation:

The given figure is a trapezium which is a quadrilateral with four sides.

But,

Sum of angles in a quadrilateral = (n - 2) x 180

where n is the number of sides.

For a quadrilateral, n = 4. So that,

Sum of angles in a quadrilateral = (4 - 2) x 180

                             = 2 x 180

                             =

The sum of angles in a quadrilateral is .

Thus,

+ + + =

+ =

= -

   =

The value of x is .

i can

step-by-step explanation: