Haha suena xjdie d chen d djdjx d n be. djdnx

The missing side is 12.

Step-by-step explanation:

To find the answer you want to divide the sides that are similar.

15/5=3

9/3=3

Both answers are three so you want to multiply 4 by 3 which equals 12.

The missing side is 12.

Step-by-step explanation:

divide the sides that are similar.

15/5=39/3=3

Both answers are three so you want to multiply 4 by 3 which will equal 12.

practice. practice. practice.

for the friend request.

when a figure, such as triangle (xyz) is reflected over the line y = x to create x'y'z' the x-coordinates and y-coordinates of the original image (pre-image) will be reversed for the image. (e.g., (x, y) > (y, x)) this means that the pre-image position of the x- and y-coordinates switch places which in turn provides a mirror like image of the original xyz.  

i notice that when i draw a line segment from x to x', that the points are parallel from each other -- they are exactly across from each other and do not intersect with any other points.  

yes, think i would see the same characteristic if you drew the line segment connecting y with the reflecting line and then y' with the reflecting line because of the essence of reflections. because it is a mirror image, each point was effected the same way which leads me to conclude that they same would apply to y and y'.