Lesson 17: Side lengths and angle measures of congruent figures

Before you have access to this lesson from the links below, click on “Materials” to see what’s covered. The exercise is expected to last for not more than 1 hour 3o minutes, and please, be ready to complete this lesson in ONE session. If you haven’t signed up for the IXL SKILLS package, the temporal login info that you purchase from the link below, will be valid for 48 hours. 

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Warmup: The second H-shaped polygon below is a scaled copy of the first. Consider labeling corresponding parts or some of the vertices.

(1.) On the diagram, show one pair of corresponding points and two pairs of corresponding sides in the original polygon and its copy.

(2.) What scale factor takes the original polygon to its smaller copy? Explain or show your reasoning.

Activity #1 (30 minutes)

1. Topic: Side lengths and angle measures of congruent figures(Applet).

2. Explainer Video: Side lengths and angle measures of congruent figures.

Practice Exercise (30 minutes).

Topic: Side lengths and angle measures of congruent figures.

Quiz Time – (Two sets: 30 minutes).

Topic: Side lengths and angle measures of congruent figures (to be taken while you are logged in).

  1. An applet.
  2. An explainer video on "Side lengths and angle measures of congruent figures".
  3. A skills exercise from the IXL website on "Side lengths and angle measures of congruent figures". The questions exhibit an increasing order of difficulty. 
  4. Two sets of quizzes on "Side lengths and angle measures of congruent figures". The questions exhibit an increasing order of difficulty, and an average score of 80% expected.