Understanding Quadrilaterals

Maths
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If an angle of a parallelogram is four-fifths of its adjacent angle, what are the angles of the parallelogram?



A
B
C
D
Hard
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Which of the following statement(s) is/are correct ?

A
A parallelogram in which two adjacent angles are equal is a rectangle.
B
A quadrilateral in which both pairs of opposite angles are equal is parallelogram
C
In a parallelogram the number of acute angles is two.
D
All of these
Hard
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If ABCD is a parallelogram, then 

A
B
C
between &
D
None of these
Hard
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