1.

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=120
Answer» B. ▀PQRS ∠A=90,∠B=90,∠C=90,∠D=90


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