Answer:
x is 107cm
Explanation:
We are told that the window and the door are similar rectangles.
Similar rectangles are rectangles with the same length and width ratio.
We can find the ratio by looking at the widths of the door and the window.
The window's width is 2x smaller than the door's width so that window's height must be 2x smaller than the door's height.
The door's height is 214cm.
214 ÷ 2 = 107
x is 107cm