Trigonometria i semblança

fig. semblants      -angles iguals                            -costats prop.  
                               -raó K [ 3/2->1'5]                       -rel permimetre-> Pg=K·Pp   [P= + cost.]
                                                                                             arees-> Ag=K²·Ap   [A=b·a]
                                                                                             volums-> Vg=K³·Vp  [V=ar.bas.·alt.]

Teoremes       -Tales->                       ->2/3=x/5     -Pitagores->                      a²=b²+c²

                         -Catet-> b²= a·n                                 -Altura-> h²=m·n
                                    -> c²=a·m

                                                                                                                                          ? = inv (shift+sin/cos/tg)
-Rel angles i rad-> 180=?                                            -Raons trigonom.  sin?=b/a      |  cos?=c/a  |  tg?=b/c
180---?                                                                                                             cosec?=a/b  |  sec?=a/c  |  cotg?=c/b
15-----x=15?/180=5?/60=?/2                                                                      tg? tenint sin? i cos?-> sin?/cos?= tg?
                                                                                                                             sin?²+cos?² =tg?