1) 2a = {-2,5 × 2; 2,5 × 2} = {-5; 5} = b
∠(a, b) = ∠(2a, b) = ∠(b, b) = 0°
2) b = {6 × ; 3 × } = {2; 1}
∠(a, b) = ∠(a, b) = ∠({-1; 2}, {2; 1}) = 90°
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Answers & Comments
1) 2a = {-2,5 × 2; 2,5 × 2} = {-5; 5} = b
∠(a, b) = ∠(2a, b) = ∠(b, b) = 0°
2)
b = {6 × 
; 3 × 
} = {2; 1}
∠(a, b) = ∠(a,
b) = ∠({-1; 2}, {2; 1}) = 90°