BA = (2-4, -1-(-1), 2-3)
BA = (-2,0,-1)
AC = (2-2, 0-(-1), 5-2)
AC = (0,1,3)
|BA| = √(2²+1²) = √5
|AC| = √(1²+3²) = √10
BA.AC = |BA|.|AC|.cos(∅)
-2.0+0.1-1.3 = √5.√10.cos(∅)
-3 = 5√2.cos(∅)
cos(∅) = -3/(5√2)
b = √((5√2)²-(-3)²)
= √(50 - 9)
b = √(41)
tan(∅) = √41/3 = 1/3 . √41
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BA = (2-4, -1-(-1), 2-3)
BA = (-2,0,-1)
AC = (2-2, 0-(-1), 5-2)
AC = (0,1,3)
|BA| = √(2²+1²) = √5
|AC| = √(1²+3²) = √10
BA.AC = |BA|.|AC|.cos(∅)
-2.0+0.1-1.3 = √5.√10.cos(∅)
-3 = 5√2.cos(∅)
cos(∅) = -3/(5√2)
b = √((5√2)²-(-3)²)
= √(50 - 9)
b = √(41)
tan(∅) = √41/3 = 1/3 . √41