Journal; 1.8.4, geometry

2. Looking at the Consecutive Interior Angles (9 points)

Look at the diagram of the scenario below. A steep downhill ski slope is intersected at an angle by a less steep ski slope. Safety fences need to be set up in the locations shown. The angles of the fences, angles 1 and 2, can be determined by finding the relationship between the angles a and b.


Draw a geometric diagram of this scenario using two parallel lines and one transversal. (Remember that a transversal is a line which cuts across parallel lines.) Label the angles, parallel lines, and transversal as indicated in the diagram above. (2 points)


Starting with the fact that angles 1 and a are a linear pair and that angles b and 2 are also a linear pair, use a two column proof to prove that consecutive interior angles a and b are supplementary. (5 points)
Statement Reason


Explain what the result of your proof tells you about angles a and b. Specifically, if you measured one angle, what would you know about the other? (2 points)


3. The Exterior Angles (6 points)

The fences will be aligned with the exterior angles ∠1 and ∠2. What are some other relationships you can see between ∠1, ∠2, ∠a, and ∠b? (2 points)

Which of the relationships you listed above will be the most helpful in figuring out the measurements of the safety fences? (2 points)

What is the measure of ∠2? (2 points)


4. Reflections (2 points: 1 point each)
Can you think of any other real-life scenarios where parallel lines and transversals exist?



What are the limitations of the ski slope scenario as a real-life example?

The measurement of the angles formed between parallel lines having a common transversal are readily determined by the relationship between the angles

The measures of the angles in the figures are as follows;

2. The required two column proof is presented as follows;

Statement  [tex]{}[/tex]                                                  Reason

∠1 and ∠a are linear pair angles   [tex]{}[/tex]             Given

∠1 + ∠a = 180° [tex]{}[/tex]                                             Linear pair ∠s are supplementary

∠2 and ∠b are linear pair angles   [tex]{}[/tex]            Given

∠2 + ∠b = 180°                                             Linear pair ∠s are supplementary

∠a and ∠b are consecutive interior ∠s   [tex]{}[/tex]   Definition

x║y    [tex]{}[/tex]                                                           Given

∠1 and ∠b are corresponding angles  [tex]{}[/tex]      Definition

∠1 ≅ ∠b   [tex]{}[/tex]                                                     Corr. ∠s formed between║ lines

∠1 = ∠b   [tex]{}[/tex]                                                      Definition of congruency

∠a + ∠b = 180°                                              Substitution property

∠a and ∠b are supplementary  [tex]{}[/tex]                  Definition

The information obtained from the proof is that given ∠1 and ∠b are located in corresponding locations relative to the common transversal of the parallel lines, they (∠1 and ∠b) are equal, and therefore, the the sum of ∠a and ∠b is 180°, given that the sum of ∠1 and ∠a is 180° by substitution property of equality. Which gives that ∠a and ∠b are supplementary angles. Therefore

3. Some of the other relationships between ∠1, ∠2, ∠a, and ∠b, are;

4. A real-life scenario where parallel lines and transversal exist are the handrail and baluster on railings of staircases

The limitations of the Ski slope scenario are;

Learn more about parallel lines having a common transversal here:

https://brainly.com/question/2188951

c. Explain what the result of your proof tells you about angles a and b.

Specifically, if you measured one angle, what would you know about the

other? (2 points)

Select all the equations that are true:

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(-12b - 6 + 9b - 18) equivalent to 2(b + 8)? Show your work.(please help)

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Solve.


x + 7 = –2


A. 9

B. 5

C. –5

D. –9

1. (08.01, 8.02 MC) An expression is shown below: 2x3y2 + 18xy2 − 20x2y − 180y Part A: Rewrite the expression so that the GCF is factored completely. (4 points) Part B: Rewrite the expression completely factored. Show the steps of your work. (6 points) (10 points)

Multiply:

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Resolva:
12,548:9
62,547÷7
5,127÷25

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D. = +4.6

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13 POINTS FOR THIS PLEASE

2. The volume of a cylinder varies jointly with its height and the square of the radius. A 7.85 cubic inch spice container is 2.5 inches tall and has a radius of 1 inch. Another spice container is 3 inches tall with a radius of 1.5 inches, what would be the volume?

If you left a $25.00 on your table for a $21.50 meal, what was the percent of the tip?

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The student council sent its members on four field trips during the school year. The number of
buses needed to transport the members on each field trip is a function of the number of members
who went on each trip. This function consists only of the ordered pairs (52,3), (72, 4), (86,5),
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Write an equation that describes the function.

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Tyler is simplifying the expression 6−2x+5+4x . Here is his work:


6−2x+5+4x

(6−2)x+(5+4)x

4x+9x

13x



a. Tyler’s work is incorrect. Explain the error he made.

D 122x - 123y + 124
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