Trigonometry For Beginners!

[DIYSwede]

Nearly 50 years ago, in math class our teacher claimed that "EACH triangle has 180 degrees as sum of its angles".
Being a smart-ass kid (as I was, even back then) I thought about that and returned a few days later, smugly stating:
"Assume a triangle with one point at the North Pole, and its other points on the Equator at 0 deg meridian and at 90 deg E (or W).
Now this would be a triangle with an angular sum of 270. -Right?"

My teacher dryly remarked that his 180 deg sum was for PLANAR geometry, and that we should stick to this for another 5 years...

A few years ago, my then 12 year old daughter commented on my swearing as I burned my hand at 65 deg C in the dishwasher:
-"Good thing you didn't put the hand in the corner then, Daddy - as it's ninety in there!"

-What goes around, comes around...