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Which of the following is an invalid quadrilateral?(a) ▀ABCD ∠A=60,∠B=120,∠C=120,∠D=90(b) ▀PQRS ∠A=90,∠B=90,∠C=90,∠D=90(c) ▀LMNO ∠A=90,∠B=150,∠C=60,∠D=60(d) ▀EFGH ∠A=100,∠B=20,∠C=120,∠D=120This question was addressed to me in an online quiz.The query is from Geometry topic in section Practical Geometry of Mathematics – Class 8 |
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Answer» The correct choice is (a) ▀ABCD ∠A=60,∠B=120,∠C=120,∠D=90 |
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