Question

I'm always confused about using sine/cosine

e.g. calculator gives for cos(63) = 0,45399
it was set to "deg"

Determine this form and what other forms are there?

Answer 1

there are 2 basic ways to define an angle (and a lesser used british flop)

Answer 2

angles can be measured in degrees, radians, are grads

Answer 3

*or grads

Answer 4

yes, those are the three :)

Answer 5

100 grads = 90 degrees
180 degrees = pi radians
... think thats all thats needed to convert stuff

Answer 6

ok so basically if I have the calculator set to Deg
then cos(63) would mean cos(63°)

and if I set the calculator to Rad
then cos(63) would mean cos(63r) ?

Answer 7

correct

Answer 8

i tend to test out cos(90) to test the mode

Answer 9

whats the right notation for a rad? an angle has °, does rad have anything like it?

Answer 10

rad tends to be "unit less" in notation if approximated. otherwise it usually has pi attached to it.

Answer 11

radians use the radius itself as a unit of measure; whereas degrees is purely a turning

Answer 12

thanks

Answer 13

youre welcome