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Introduction |
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Rectilinear Figure : A plane figure bounded by straight lines is called a rectilinear figure. |
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Theorem1 |
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In a polygon of 'n' sides, the sum of the interior angles is equal to (2n - 4) right angles. |
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Quadrilaterals |
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A quadrilateral is a polygon having 4 sides. ABCD is a quadrilateral and AC and BD are its diagonals. |
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Theorem2 |
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The opposite sides and angles of a parallelogram are equal. |
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Theorem3 |
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The diagonals of a parallelogram bisect each other. |
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Theorem4 |
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If a pair of opposite sides of a quadrilateral is equal and parallel, it is a parallelogram. |
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Theorem5 |
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A rhombus is a parallelogram whose diagonals meet at right angles. |
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Construction of Special types of Quadrilaterals |
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(a) Two sides and an angle are given. (b) Diagonals and the angle included by them are given. |
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Construction of Special types of Quadrilaterals (cont..) |
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(a) Construction of a Regular Hexagon. (b) Construction of a Regular Pentagon. |
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Summary |
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If the sides of a convex polygon are produced, in order, the sum of the exterior angles is 4 right angles. |
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Question and Answers |
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