.1.
, , DAB, DAC, DBC dAB, dAC, dBC
- dAB, dAC
, (. .1, )
, dAB=DAB*cos
. .
. ( )
: |
.1. , , DAB, DAC, DBC dAB, dAC, dBC - dAB, dAC , (. .1, ) , dAB=DAB*cos
. . . ( )
: 2015-10-01; !; : 322 | : : . |