Diagonals of a Parallelogram
Given the parallelogram STUV, it can be proven that the diagonals VT and SU bisect each other, that is, they define a point Z where:
SZ = ZU
VZ = ZT
We are given the following lengths:
SZ = 5
VT = 14
Since:
SZ = ZU
It follows that:
ZU = 5
The total length of the diagonal VT is cut in half by point Z, which defines the lengths:
VZ = 14/2 = 7
ZT = VZ = 7
Finally, since SU is the total length of the diagonal, then:
SU = SZ + ZU = 5 + 5 = 10
Summarinzing:
ZU = 5
SU = 10
VZ = 7
ZT = 7