Question

If a and b are the adjacent sides of a parallelogram, then |a+b| = |a -b| is a necessary and sufficient
condition for the parallelogram to be a
(a) Rhombus
(b) Square
(c) Rectangle
(d) Trapezium
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Answer 1

Option C that parallelogram is a rectangle

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Answer 2

C is the answer ,if A and B are adjacent angle then side of paragraph will be a + b is equals to a minus b its necessary and sufficient for only rectangle