Curriculum / Math / 4th Grade / Unit 8: Shapes and Angles / Lesson 18
Math
Unit 8
4th Grade
Lesson 18 of 18
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Identify and draw lines of symmetry in two-dimensional figures.
The core standards covered in this lesson
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.
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Watch 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.
a.
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.
Problem Set
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A task that represents the peak thinking of the lesson - mastery will indicate whether or not objective was achieved
Which of the following shows a line of symmetry?
Draw as many lines of symmetry as you can find in the figure below.
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Lesson 17
Topic A: Lines and Angles
Identify and draw points, lines, line segments, rays, and angles.
4.G.A.1 4.MD.C.5
Identify and draw right, obtuse, and acute angles.
4.G.A.1
Identify and draw perpendicular lines.
Identify and draw parallel lines.
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Topic B: Measures of Angles
Use iteration with one physical nonstandard unit to measure benchmark angles.
4.MD.C.5 4.MD.C.6
Understand that an angle that turns through $${{1\over360}}$$ of a circle is called a “one-degree angle” and can be used to measure angles. Use a makeshift protractor to measure benchmark angles.
Measure angles that are less than 180° using a 180° protractor. Distinguish angle measure from other attributes.
Sketch angles of specified measure using a 180° protractor.
Identify and measure angles as turns and recognize them in various contexts.
Topic C: Measures of Adjacent Angles
Decompose angles using pattern blocks.
4.MD.C.7
Solve problems involving the measure of two adjacent angles.
Solve problems involving the measure of more than two adjacent angles.
Measure and sketch angles that are greater than 180°.
4.MD.C.5 4.MD.C.6 4.MD.C.7
Topic D: Shapes and Lines of Symmetry
Analyze and classify triangles based on side length, angle measure, or both.
4.G.A.1 4.G.A.2
Draw triangles from given criteria.
Analyze and classify quadrilaterals based on parallel and perpendicular lines and the presence or absence of angles of a specified size.
Draw quadrilaterals from given criteria.
4.G.A.3
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