Stage 19

在此討論吧

what to do
did you change it ?

lindsay 寫到:what to do
did you change it ?

yeah, it is easy if you have studies trigonometric functions.

I do study trigonometric functions but only sin cos and tan
not for the others
which formula should i use

lindsay 寫到:I do study trigonometric functions but only sin cos and tan
not for the others
which formula should i use

you need to use asin(another name is sin^-1), acos(another name is cos^-1), atan(another name is tan^-1).
And also Heron's formula, laws of sine, laws of cosine...

After calculating
My answer is 7.****.html
but it isn't correct
why

lindsay 寫到:After calculating
My answer is 7.****.html
but it isn't correct
why

7.4***

that's my answer
7.4**4

pass