27.5.1 Proving Parallel and Perpendicular with Vectors
27.5 Putting Vectors to Work: Geometry and Physics
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27.5.1 Proving Parallel and Perpendicular with Vectors
Core idea
To show two lines are parallel, find a λ; to show they're perpendicular, make the dot product 0, and the geometry problem becomes an equation.
Module goal. Use vectors as a toolkit to prove geometric theorems, compute lengths and angles, handle forces and velocities, and lay the groundwork for vectors in space.
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