Parallel lines are lines that never cross each other - they keep the same distance apart from each other. When two lines intersect, the opposite (X) angles are equal. On parallel lines, alternate (Z) ...
Higher - The gradients of two perpendicular lines will always multiply to make –1. Make sure you are familiar with finding the equation of a line and calculating gradient to understand equations of ...
OPTICAL ILLUSIONS are images that trick the brain into seeing things that aren’t necessarily there. One optical illusion has had viewers baffled, asking them to decide whether the lines are parallel ...
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