Opposite angles of a parallelogram are always:

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A Complementary
B Equal
C Supplementary
D 90 degrees

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Answer: B. Equal

In a parallelogram, each pair of opposite angles is equal, for example angle A = angle C and angle B = angle D. It is adjacent angles (next to each other) that are supplementary, adding to 180 degrees, so option c is a trap.

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Opposite angles of a parallelogram are always:

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