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4. Rectangles

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Exercise 35 Page 509

Show that the other angles are also right angles.

See solution.

Practice makes perfect

We are asked to write a paragraph proof to show that if a parallelogram has a right angle, then it is a rectangle.
Proof:

According to Theorem 6.6, if a parallelogram has a right angle, then all angles are right angles. If all angles of a parallelogram are right angles, then by definition it is a rectangle.

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Exercises p.508-511

Exercise 35 Page 509

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