Chapter 13

Symmetry

How can I identify lines of symmetry in figures and identify figures with rotational symmetry?
How can I do hands on activities that involve folding and cutting patterns to understand line symmetry and rotational symmetry?
How can I complete and create symmetric patterns on grid paper?

Students will know and understand:

Students Will:

Identify a line of symmetry of a figure.
Relate rotational symmetry to turns.
Trace a figure to determine whether it has rotational symmetry.
Draw a shape or pattern about a line of symmetry and check for rotational symmetry.
Complete a symmetric shape or pattern.
Create symmetric patterns on grid paper.

Formative Test: Common

Upon completion of Unit 13:

4.OA.C.5. Generate a number or shape pattern that follows a given rule. Identify apparent features of the pattern that were not explicit in the rule itself.
4.NBT.B.6. Find whole-number quotients and remainders with up to four-digit dividends and one-digit divisors, using strategies based on place value, the properties of operations, and/or the relationship between multiplication and division. Illustrate and explain the calculation by using equations, rectangular arrays, and/or area models.
4.G.A.3. Recognize a line of symmetry for a two-dimensional figure as a line across the figure such that the figure can be folded along the line into matching parts. Identify line-symmetric figures and draw lines of symmetry.
MP.1. Make sense of problems and persevere in solving them.
MP.2. Reason abstractly and quantitatively.
MP.3. Construct viable arguments and critique the reasoning of others.
MP.4. Model with mathematics.
MP.5. Use appropriate tools strategically.
MP.6. Attend to precision.
MP.7. Look for and make use of structure.
MP.8. Look for and express regularity in repeated reasoning.