Chapter 5: Q. 14 (page 200)
Complete the following statement.
If a regular polygon has 40 sides, the measure of each interior angle is ___?
Short Answer
If a regular polygon has 40 sides, then the measure of each interior angle is 171 degrees.
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Chapter 5: Q. 14 (page 200)
Complete the following statement.
If a regular polygon has 40 sides, the measure of each interior angle is ___?
If a regular polygon has 40 sides, then the measure of each interior angle is 171 degrees.
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Prove Theorem 5-3.
Each figure in Exercises 19-24 is a parallelogram with its diagonals drawn. Find the values of x and y.

Write a paragraph proof: The sum of the lengths of the segments drawn from any point in the base of an isosceles triangle perpendicular to the legs is equal to the length of the altitude drawn to one leg.
State the principal definition or theorem that enables you to deduce, from the information given, that quadrilateral SACK 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.

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