Question

Dots trijstūris ABC AB=3, AC=4, leņķīs BAC =60 gradusi Aprēķini malas BC garumu?

Answer 1

Теорема cos:

BC^2=AB^2 + AC^2 -2AB*AC*cos BAC

BC^2=9 +16 - 2*3*4*cos 60= 25- 24*1/2=25 - 12 = 13

BC = корень(13)