Illustrative Mathematics - Geometry - Mathematics - Unit 1 - Lesson 15

For each figure, identify any lines of symmetry the figure has.

Tags

G.CO.3

8.G.1.c

G.CO.4

G.CO.2

8.G.1.a

8.G.1.b

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.

Tags

G.CO.3

8.G.1.c

G.CO.4

G.CO.2

8.G.1.a

8.G.1.b

Three line segments form the letter Z. Rotate the letter Z counterclockwise around the midpoint of segment BC by 180 degrees. Describe the result.

Tags

G.CO.3

8.G.1.c

G.CO.4

G.CO.2

8.G.1.a

8.G.1.b

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.

Tags

G.CO.3

8.G.1.c

G.CO.4

G.CO.2

8.G.1.a

8.G.1.b