Find the value of x if the image below is a kite

we know that
kite is always in shape of rhombus
and alternate sides of rhombus are always equal
so,we get
[tex] x+3=15 [/tex]
now, we can solve for x
[tex] x+3-3=15-3 [/tex]
[tex] x=12 [/tex]..............Answer