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| Introduction |
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| We are familiar with plane figures bounded by straight line segments as sides. They are known as Polygons. |
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| Polygon is a word of Greek origin. It means figure with many angles implying many sides. |
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| Squares, rectangles and other four-sided geometric figures formed by the union of four line segments are called Quadrilaterals. |
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| Quadrilateral is a four-sided polygon. |
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| Examples of quadrilaterals: |
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