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To prove that a quadrilateral is a rectangle, which of the following is NOT a valid method?a)Show all angles are 90 degreesb)Show all sides are equalc)Show it is a parallelogram with one angle equal to 90 degreesd)Show it is a parallelogram with equal diagonalsCorrect answer is option 'A'. Can you explain this answer? for Class 8 2026 is part of Class 8 preparation. The Question and answers have been prepared according to the Class 8 exam syllabus. Information about To prove that a quadrilateral is a rectangle, which of the following is NOT a valid method?a)Show all angles are 90 degreesb)Show all sides are equalc)Show it is a parallelogram with one angle equal to 90 degreesd)Show it is a parallelogram with equal diagonalsCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for Class 8 2026 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for To prove that a quadrilateral is a rectangle, which of the following is NOT a valid method?a)Show all angles are 90 degreesb)Show all sides are equalc)Show it is a parallelogram with one angle equal to 90 degreesd)Show it is a parallelogram with equal diagonalsCorrect answer is option 'A'. Can you explain this answer?.

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