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Which of the following statements about a parallelogram is not true?

A opposite sides and adjacent angles are equal
Explaination
A parallelogram is a quadrilateral with two sets of parallel sides. Opposite sides (a = c, b = d) and angles (red = red, blue = blue) are equal. The area of a parallelogram is base x height and the perimeter is the sum of the lengths of all sides (a + b + c + d).
B the perimeter of a parallelogram is the sum of the lengths of all sides
C a parallelogram is a quadrilateral
D the area of a parallelogram is base x height