Identify and draw lines of symmetry in two-dimensional figures.
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If you need to adapt or shorten this lesson for remote learning, we suggest prioritizing Anchor Task 2 (benefits from worked example). Find more guidance on adapting our math curriculum for remote learning here.
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Show the following YouTube video.
All of the following cutout shapes were made the same way, by folding a piece of paper before cutting. Where do you think the paper was folded to make each of the following shapes? Draw a line to show your thinking.
Find the line(s) of symmetry in the following geometric figures.
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b.
c.
d.
e.
Garret drew a rhombus on grid paper, and then folded the paper along the rhombus’ line of symmetry. Draw what the grid paper looks like folded.
Felicia drew part of a shape on grid paper. The folded edge is the full shape’s line of symmetry. Draw what the grid paper looks like unfolded.
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Is the line drawn a line of symmetry? Circle your choice.
Grade 4 Mathematics > Module 4 > Topic D > Lesson 12 of the New York State Common Core Mathematics Curriculum from EngageNY and Great Minds. © 2015 Great Minds. Licensed by EngageNY of the New York State Education Department under the CC BY-NC-SA 3.0 US license. Accessed Dec. 2, 2016, 5:15 p.m..
Draw as many lines of symmetry as you can find in the figure below.
Grade 4 Mathematics > Module 4 > Topic D > Lesson 12 of the New York State Common Core Mathematics Curriculum from EngageNY and Great Minds. © 2015 Great Minds. Licensed by EngageNY of the New York State Education Department under the CC BY-NC-SA 3.0 US license. Accessed Dec. 2, 2016, 5:15 p.m..
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