Illustrative Mathematics - Geometry - Mathematics - Unit 1 - Lesson 15
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7 Questions
1
1.
For each figure, identify any lines of symmetry the figure has.
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8.G.1.c
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2.
In quadrilateral BADC, AB = AD and BC = DC. The line AC is a line of symmetry for this quadrilateral.
- Based on the line of symmetry, explain why the diagonals AC and BD are perpendicular.
- Based on the line of symmetry, explain why angles ABC and ADC have the same measure.
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3.
Three line segments form the letter Z. Rotate the letter Z counterclockwise around the midpoint of segment BC by 180 degrees. Describe the result.
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4.
There is a square, ABCS, inscribed in a circle with center D. What is the smallest angle we can rotate around D so that the image of A is B?
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5.
Points A, B, C, and D are vertices of a square. Point E is inside the square. Explain how to tell whether point E is closer to A, B, C, or D.
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6.
Lines l and m are perpendicular.
Sometimes reflecting a point over m has the same effect as rotating the point 180 degrees using center P. Select all labeled points which have the same image for both transformations.
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7.
Here is triangle POG. Match the description of the rotation with the image of POG under that rotation.
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G.CO.3
8.G.1.c
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G.CO.2
8.G.1.a
8.G.1.b
This lesson is from Illustrative Mathematics. Geometry, Unit 1, Lesson 15. Internet. Available from https://curriculum.illustrativemathematics.org/HS/teachers/2/1/15/index.html ; accessed 29/July/2021.
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