Geometry 4-7 Complete Lesson: Congruence in Overlapping Triangles

Last updated over 3 years ago
26 questions
Note from the author:
A complete formative lesson with embedded slideshow, mini lecture screencasts, checks for understanding, practice items, mixed review, and reflection. I create these assignments to supplement each lesson of Pearson's Common Core Edition Algebra 1, Algebra 2, and Geometry courses. See also mathquest.net and twitter.com/mathquestEDU.
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Solve It! An assignment for your graphic design class is to make a colorful design using triangles. How many triangles are in your design? Enter only a number.

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Take Note: Define common angle (in overlapping triangles). On the canvas, sketch a pair of overlapping triangles and label a common angle.

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Take Note: Define common side (in overlapping triangles). On the canvas, sketch a pair of overlapping triangles and label a common side.

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Problem 1 Got It?

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Problem 1 Got It?

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Problem 2 Got It? Complete the proof on the canvas.

You may also complete your work on paper or on a whiteboard and upload a clear picture of it to the canvas.

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Problem 3 Got It? Complete the proof on the canvas.

You may also complete your work on paper or on a whiteboard and upload a clear picture of it to the canvas.

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Problem 4 Got It? Complete the proof on the canvas.

You may also complete your work on paper or on a whiteboard and upload a clear picture of it to the canvas.

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Separate and redraw the overlapping triangles. Label the vertices.

You may also complete your work on paper or on a whiteboard and upload a clear picture of it to the canvas.

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Separate and redraw the overlapping triangles. Label the vertices.

You may also complete your work on paper or on a whiteboard and upload a clear picture of it to the canvas.

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Reasoning: In Exercise 1, both triangles have vertices J and K. Are ∠J and ∠K common angles for △MKJ and △LJK? Explain. You may also use the canvas to help illustrate your explanation.

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Reasoning: In the figure, which pair of triangles could you prove congruent first in order to prove that △ACD ≅ △CAB ? Explain. You may also use the canvas to help illustrate your explanation.

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Enter only the word that fills the blank, with no spaces.

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Enter only the word that fills the blank, with no spaces.

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Enter only the word that fills the blank, with no spaces.

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Review Lesson 3-6: Complete the construction using the GeoGebra geometry utility (embedded below or at geogebra.org/geometry). Screenshot your final product and upload it to the canvas. Be sure to label all points and leave any evidence that indicates how you completed the task.


Draw a line p and a point M not on p. Then construct line n through M so that n is perpendicular to P.

You may leave lines and points unlabeled.

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Review Lesson 1-7: Find the coordinates of the midpoint of the segment with the given endpoints.

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Review Lesson 1-7: Find the coordinates of the midpoint of the segment with the given endpoints.
Enter your response in this format, no spaces: (-3.5,14).

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Review Lesson 1-7: Find the coordinates of the midpoint of the segment with the given endpoints.
Enter your response in this format, no spaces: (-3.5,14).

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Vocabulary Review: Identify the common side of each pair of triangles.

  • \overline{RP}
  • \overline{ZY}
  • \overline{RT}
  • \overline{WX}
  • \overline{WY}
  • \overline{AC}
  • \overline{AB}
  • △ABC and △ADC
  • △XWZ and △YWZ
  • △RST and △RPT
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Use Your Vocabulary: Refer to the diagram and identify the common regions of the overlapping figures named on the right.

  • △ABG
  • △EHD
  • △ACF
  • △GHB
  • △BEC
  • △GDF
  • △FGD and △CBE
  • △BEC and △HED
  • △ACF and △ABG
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Reflection: Math Success