MATH Integrated Math II  - Unit 15: Inequalities and Triangle Inequalities
Inequalities

Select the correct answers that complete the statements in the next nine problems.

1) The definition of an inequality states that for any real numbers, a and b, a > b if and only if there is a positive number c, such that __________.

2) True or False: The comparison property or the inequalities of real numbers is: a < b, a = b, or a > b.

3) In the transitive property of the inequalities of real numbers, if a < b, and b < c, then __________ OR if a > b, and b > c, then __________.

4) In the addition property of the inequalities of real numbers, if a > b, then a + c ____ b + c OR if a < b, then a + c ____ b + c.

5) In the subtraction property of the inequalities of real numbers, if a > b, then a – c ____ b – c OR if a < b, then a – c ____ b – c.

6) In the multiplication properties of the inequalities of real numbers, if “c” is positive and a < b, then ac ____ bc OR if “c” is positive and a > b, then ac ____ bc.

7) In the multiplication properties of the inequalities of real numbers, if “c” is negative and a < b, then ac ____ bc OR if “c” is negative and a > b, then ac ____ bc.

8) In the division properties of the inequalities of real numbers, if “c” is positive and a < b, then (a/c) ____(b/c) OR if “c” is positive and a > b, then (a/c) ____ (b/c).

9) In the division properties of the inequalities of real numbers, if “c” is negative and a < b, then (a/c) ____(b/c) OR if “c” is negative and a > b, then (a/c) ____ (b/c).

For the next six problems select the property that justifies the statement.

10) Select the property that justifies the statement.

11) Select the property that justifies the statement.

12) Select the property that justifies the statement.

13) Select the property that justifies the statement.

14) Select the property that justifies the statement.

15) Select the property that justifies the statement.

16) Point U lies on segment TV between points T and V as shown in the figure below. Complete the following statements: (a) Segment TU is less than _____. (b) Segment UV is greater than segment _____. (c) Segment UV is less than segment _____.

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17) Point U lies in the interior of angle RST as shown in the figure below. Ray SU is between rays SR and ST. Complete the following statements: (a) The measurement of angle UST is less than the measurement of angle _____. (b) The measurement of angle RSU is greater than the measurement of angle _____. (c) The measurement of angle RSU is less than the measurement of angle _____.

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Solve the next two problems using inequalities.

18) Bill is going to purchase a tractor and backhoe attachment for a payment of $625 MONTHLY for 3 years. His goal is to finance, at most, $20,000. Write an inequality comparing ”the amount he must pay back in all” to “$20,000”, and then state whether he has met his goal.

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19) For the purchase described in the previous problem, how much money must Bill pay for a down payment to meet his goal?

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20) Fill in the blank. Theorem 15-A: If an angle is an exterior angle of a triangle, then its measure is greater than the measure of either of its __________.

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21) A partial “indirect” proof of the Exterior Angle Inequality Theorem is shown in the unit link to “Inequalities”. An incomplete proof of Cases 3 and 4 are shown below. State the number and the corresponding statement or reason of each of the five missing parts of the proof.

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22) Refer to the figure below to answer the following questions. (The figure is drawn to scale.) (a) Which is greater, the measurement of angle 5 or the measurement of angle 3? (b) State one angle that is less than the measure of angle 2.

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Triangle Side and Angle Inequalities

23) Fill in the blank. Theorem 15-B: If a side of a triangle is longer than another side, then the measure of the angle opposite the longer side is greater than the measure of the __________.

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24) Read the two theorems (15-B and C) in the link to “Triangle Side and Angle Inequalities”, and then select the statement that is NOT true.

Refer to triangle RST in the figure below to answer the next two questions.

25) What are the lengths of segments (a) ST, (b) TR, and (c) RS? Round each answer to the nearest tenth.

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26) Fill in the blanks for the statement shown below.

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Find the measures of the three angles in triangle LMN based on the information given below, and then answer the next two questions. (Hint: Apply Theorem 12-A.)

27) What is (a) the value of “x”, (b) the measure of angle L, (c) the measure of angle M, and (d) the measure of angle N?

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28) Select the inequality statement that compares the lengths of the three sides of the triangle from largest to smallest.

29) In an obtuse scalene triangle, one angle measures 50 degrees. Which side is this angle opposite?

30) Fill in the blank. Theorem 15-D: The shortest segment from a point to a line is a __________ line segment between the point and the line.

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31) Copy or print out the partial proof of Theorem 15-D shown below. State the number and the corresponding statement or reason. There are three missing parts of the proof.

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Triangle Inequality Theorem

32) Fill in the blank. Theorem 15-E (Triangle Inequality Theorem): The sum of the lengths of any two sides of a triangle is __________ than the length of the third side.

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33) Will the three segments given below form a triangle? Explain why or why not.

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34) Which set of lengths will form a triangle?

Hinge Theorem

35) Fill in the blank. Theorem 15-F [Hinge Theorem (SAS Inequality)]: If two sides of a triangle are congruent to two sides of a second triangle and if the included angle on one triangle is greater than the included angle on the second triangle, then the third side of the first triangle is __________ than the third side of the second triangle.

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36) Which side is longer?

37) Study the information and figure given below. Which statement is true?

38) Please explain how the Hinge Theorem could be used to solve the previous problem.

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SSS Inequality

39) Fill in the blanks. Theorem 15-G (SSS Inequality Theorem): If two sides of a triangle are congruent to two sides of a second triangle, and if the third side of one triangle is greater than the third side of the second triangle, then the __________ between the two congruent sides in the first triangle is greater than the __________ between the two congruent sides in the second triangle.

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40) Which angle is greater in size?

41) Study the information and figure given below. Which statement is true?

42) Write an inequality to describe a solution for “t” in the figure below, and then solve for “t”.

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43) Draw a picture to illustrate the information given below, and then answer the following questions: a) What is the value of “x”? (b) What is the measure of angle AMB? (c) What is the measure of angle AMC? (d) Which side of the triangle is longer, AB or AC?

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Extended Assignment: Check with your instructor to see if he/she is interested in awarding extra credit to you for completing the proof of the given information and figure shown below. If so, type up the formal proof in a word-processing document showing statements and reasons, and then send the proof to your instructor through VLA email.

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