Grade 6 Mathematics · Unit 10: Math Is...Standard MPP.7

Lesson 10.210.2 Small Group · Group 2

Group 2 · Set BSecond challenge form · new problems, same idea

Mastery check☐ Exceeds☐ Meets target☐ Needs practice
Name Date Period

Learning target I can use bilateral symmetry to describe structure in nature and in human creations, explain how I can tell, and judge a case I have not seen before.

Remember10.2 Small Group · Group 2

A figure is symmetric only when every point has a mirror point the same distance away on the other side of the line. To test for symmetry, check that every point has a mirror point. One point with no match breaks the symmetry.

Words: symmetric (simétrico)mirror image (imagen reflejada)bilateral symmetry (simetría bilateral)line of symmetry (eje de simetría)balance (equilibrio)

  1. 1Complete each step, then write the final answer.

    A shape is symmetric across the y-axis. Its left half has corners at (0, 0), (−5, 1), (−2, 4), and (0, 6). How many corners does the whole shape have?

    Show your work
    Final answer:
  2. 2Complete each step, then write the final answer.

    The x-axis is a line of symmetry. A point is at (−6, 4). Its mirror point is at (−6, ?). What is the missing number?

    Show your work
    Final answer:
  3. 3Complete each step, then write the final answer.

    The front of a building is symmetric across a center line. The left half has 6 windows. 2 more windows sit on the center line. How many windows does the front have in all?

    Show your work
    Final answer:
  4. 4Complete each step, then write the final answer.

    A shape is symmetric across the y-axis and across the x-axis. One corner is at (2, 6). What is the least number of corners the shape can have?

    Show your work
    Final answer:

Explain your thinkingA shape can look balanced but still not be symmetric. How do you test a line of symmetry? What does one unmatched corner tell you?

How did it go? ☐ 4 · I can teach it☐ 3 · I've got it☐ 2 · I need a hint☐ 1 · I need help