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Biblioteka

Open Up - Grade 8 - Mathematics - Unit 1 - Lesson 14

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"Source: Open Up Resouces (Download for free at openupresources.org.)"

Pitanje 1
1.

Use the diagram to find the measures of each angle.

(Only one answer per angle)

  • 130

  • 40

  • 140

  • 90

  • 180

  • 60

  • 50

  • Angle ABC

  • Angle EBD

  • Angle ABE

Pitanje 2
2.

Lines k and l are parallel, and the measure of angle ABD is 19 degrees.

Explain why the measure of angle ECF is 19 degrees. If you get stuck, consider translating line l by moving B to C.

Pitanje 3
3.

Lines k and l are parallel, and the measure of angle ABD is 19 degrees.

What is the measure of angle BCD?

Pitanje 4
4.

The diagram shows three lines with some marked angle measures.

Find the missing angle measures marked with question marks.

Pitanje 5
5.

The two figures are scaled copies of each other.

What are some ways that you can tell they are scaled copies?

Pitanje 6
6.

The two figures are scaled copies of each other.

What is the scale factor that takes Figure 1 to Figure 2?

Pitanje 7
7.

The two figures are scaled copies of each other.

What is the scale factor that takes Figure 2 to Figure 1?(Keep your answer as a fraction.)