Question

How do I calculate the length from X to Z

Answer 1

Look at the jpeg

Answer 2

gianfranco miscalculated. Although his approach is right.
Answer: xz=63

Answer 3

A clan look again I believe I am correct still. I would like to hear from you as to how you arrived at your answer of 63

Answer 4

79 is the total length from Y to Z. I think you took it from U to Z.

Answer 5

TZ = 79
XT = 7
Therefore
XZ = 86

Answer 6

TZ and UZ are equal

Answer 7

That' s right . TZ=UZ
But UZ is not 79.

Answer 8

What an idiot I am !!!!! I must get to the optician at once. Thanks AClan ")

Answer 9

Thanks for the kind words! Enjoy your medal :)