Chapter 5: Q15 (page 168)
Draw a quadrilateral that isn’t a parallelogram but does have two angles opposite each other.
Short Answer
The diagram of a quadrilateral that isn’t a parallelogram but does have twoangles opposite each other is:

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Chapter 5: Q15 (page 168)
Draw a quadrilateral that isn’t a parallelogram but does have two angles opposite each other.
The diagram of a quadrilateral that isn’t a parallelogram but does have twoangles opposite each other is:

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The coordinates of the three vertices of a parallelogram are given. Find all the possibilities you can for the coordinates of the fourth vertex.
State the principal definition or theorem that enables you to deduce, from the information given, that quadrilateral SACK is a parallelogram.

For exercises, 14-18 write paragraph proofs.

Given: parallelogram ABCD, bisects ; bisects .
Prove: AMCN is a parallelogram.
Study the markings on each figure and decide whether ABCD must be a parallelogram. If the answer is yes, state the definition or theorem that applies.

Study the markings on each figure and decide whether ABCD must be a parallelogram. If the answer is yes, state the definition or theorem that applies.

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