Chapter 5: Q1 (page 199)
Complete the following statement with the word always, sometimes, or never.
A square is ___ a rectangle.
Short Answer
A square is always a rectangle.
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Chapter 5: Q1 (page 199)
Complete the following statement with the word always, sometimes, or never.
A square is ___ a rectangle.
A square is always a rectangle.
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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.

The coordinates of the three vertices of a parallelogram are given. Find all the possibilities you can for the coordinates of the fourth vertex.
Quad. DECK is a parallelogram. Complete.

If and , then and
For exercises, 14-18 write paragraph proofs.

Given: parallelogram ABCD, bisects ; bisects .
Prove: AMCN is a parallelogram.
Draw and label a diagram. List what is given and what is to be proved. Then write a two-column proof of the theorem.
Theorem 5-5.
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