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The horizon runs horizontal. Perpendicular to that is VERTICAL.
Lines that go side to side, but never touch, are known as parallel lines. The two railway lines on which a train runs along is a common example of parallel lines.
A chord is a straight line within a circle that divides the circle into two parts - these parts are called arcs.The diameter is a chord that runs through the centre of the circle and divides the circle into two equal parts.
1. The windshield of a car.2. When water runs down a sink or bathtub.3. When a skateboard runs down a ramp.4. A wheelchair down a ramp.
so rain water runs off the roof