Question

30°
90°
X = ???????

Answer 1

Explanation:

That is a rhombus, the properties of a rhombus say that diagonals bisect each other perpendicularly meaning the meet at a right angle.

x is simply 90°

or you can use the reason that x and 90° are on a straight line meaning x+90°=180°

x=180°-90°

∴x=90°

Answer 2

x = 90°

Explanation:

'x' plus the 90° next to it form a straight line , which is 180°