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SubjectsMathematics
समांतर चतुर्भुज के गुणधर्म
In this Class 9 Mathematics topic from the chapter Quadrilaterals, students explore the defining properties of a parallelogram and learn how to apply them in geometric reasoning. They study why opposite sides are parallel and equal, opposite angles are equal, adjacent angles are supplementary, and the diagonals bisect each other. The topic also develops proof-writing skills and helps students identify missing angles, lengths, and relationships in diagrams using these properties.
TOPIC PRACTICE
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A fundamental property of a parallelogram is that each pair of adjacent interior angles is supplementary; their sum is 180°. Therefore, the required angle is 180° − 82° = 98°. The value 82° belongs to the opposite angle because opposite angles of a parallelogram are equal. The other values do not make the adjacent-angle sum 180°.
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