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SL Parallel & Perpendicular Lines

PARALLEL: train tracks that MUST never cross, but there are many other situations in which "two straight lines will never cross" e.g. the path of two ships on the sea/ocean, two lanes full of cars (though not always straight!), the strings on an instrument etc.PERPENDICULAR: if gravity didn"t act at 90° to the earth"s surface, maybe we would be less interested in the properties of 90° angles? Yet, right-angles (perpendicular,...

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