A quadrilateral with at least one pair of parallel sides. Also known as trapezoid.
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In any triangle, if a line intersects two sides of the triangle and is parallel to the third, then and only then the intersecting line divides the sides proportionally.
A circle with radius 1.
An object that has a magnitude (length) and direction. Vector algebra is widely used in physics.
A point where two lines, curves or edges meet.