In case this is not a troll: consider, for a second, that you want to measure the distance between the
Earth and
Proxima Centauri --- still care to use a
ruler ?
Do you like your
bridges, your
house, your
supermarket to stand up or crash to the ground ? Remember that they are designed with very
concrete physic rules, that heavily use ...
geometry. And
calculus, of course.
It is a pity that, when studying basic geometry, people are normally exposed to silly examples and kind-of-pointless
exercises: nonetheless, one has to practice in order to learn.
I don't want to sound snotty, but to have someone know what Cat5 cable is and not understand the importance of geometry is a symptom of a sick education system.