Should be .1 cm, not 1 cm.
Aka 1 mm. Sorry, didn’t get enough sleep.
It's not lack of sleep that's causing you to embarrass yourself, it's the natural outcome of mixing a heaping of idiocy with too much arrogance and impatience.
Yosemitest was upfront and was asking for help in understanding the math and expressions.
While you may have learned a few mathematical symbols and operations, it surely hasn't helped with your lack of maturity or common sense.