θ
unit length
⟨a, b⟩ = |a| |b| cos θ = a1 b1 + a2 b2 = 0.699
a = (0.548, 1.05)
|a| = 1.182
b = (1.14, 0.0703)
|b| = 1.144
θ = 1.03
cos θ = 0.517
a
ax
ay
b
bx
by
start