Porisma
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Vectors: magnitude, direction and products

Find the requested angle without reversing one vector · Diagrams

Use the angle at the common vertex B

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Example 13: BA and BC both point away from B, with obtuse included angle 118.6 degrees. This is a view within their plane, not a coordinate projection. Displacements BA=(0,1,2) and BC=(1,2,−3) give dot −4 and lengths√5,√14. The source acute-looking sketch is illustrative, not the numerical angle.
Example 13: BA and BC both point away from B, with obtuse included angle 118.6 degrees. This is a view within their plane, not a coordinate projection. Displacements BA=(0,1,2) and BC=(1,2,−3) give dot −4 and lengths√5,√14. The source acute-looking sketch is illustrative, not the numerical angle.
Example 13: BA and BC both point away from B, with obtuse included angle 118.6 degrees. This is a view within their plane, not a coordinate projection. Displacements BA=(0,1,2) and BC=(1,2,−3) give dot −4 and lengths√5,√14. The source acute-looking sketch is illustrative, not the numerical angle.
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