PROOF 157
Prove.
If the dot product is zero, the vectors are perpendicular
On plane vectors.
Definition D1
Call 0 = (0, 0) the zero vector. When a ≠ 0, b ≠ 0 and the angle between the two vectors is 90°, write a ⊥ b and call the two vectors perpendicular.
Proof.
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