Answer:
24
Explanation:
The vertically opposite angles make it possible to say that the two triangles are similar. The reason is that you are give 1 pair of angles being equal and the vertically opposite angles make a second pair. By AA, the triangles are similar.
Hint: always put the line labeled x in the numerator of the proportion that you set up.
so
x/8 = 15/5 For just this question reduce the right side
x/8 = 3 Now multiply both sides by 8
8*x/8 = 3*8 Do the multiplicaton
x = 24