Curriculum / Math / 4th Grade / Unit 8: Shapes and Angles / Lesson 7
Math
Unit 8
4th Grade
Lesson 7 of 18
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Lesson Notes
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Measure angles that are less than 180° using a 180° protractor. Distinguish angle measure from other attributes.
The core standards covered in this lesson
4.MD.C.5 — Recognize angles as geometric shapes that are formed wherever two rays share a common endpoint, and understand concepts of angle measurement:
4.MD.C.6 — Measure angles in whole-number degrees using a protractor. Sketch angles of specified measure.
The essential concepts students need to demonstrate or understand to achieve the lesson objective
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Tasks designed to teach criteria for success of the lesson, and guidance to help draw out student understanding
25-30 minutes
Below are three angles, $$\angle A$$, $$\angle B$$ and $$\angle C$$.
Which angle has the greatest measure? How do you know?
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a. Estimate the measure of each angle in Anchor Task 1.
b. Using a 180° protractor, find the exact measure of each angle in Anchor Task 1.
a. Use a 180° protractor to find the measure of each angle in degrees.
b. Use a 180° protractor to measure the labeled angles in each figure.
Grade 4 Unit 7 Lesson 10 Activity 1, accessed on Oct. 16, 2023, 8:39 a.m., is licensed by Illustrative Mathematics under either the CC BY 4.0 or CC BY-NC-SA 4.0. For further information, contact Illustrative Mathematics.
15-20 minutes
Problem Set
A task that represents the peak thinking of the lesson - mastery will indicate whether or not objective was achieved
5-10 minutes
First, estimate the measure of each angle below. Then, use a protractor to find their measure, in degrees.
a.
Estimate: __________
Measurement: __________
b.
c.
d.
The Extra Practice Problems can be used as additional practice for homework, during an intervention block, etc. Daily Word Problems and Fluency Activities are aligned to the content of the unit but not necessarily to the lesson objective, therefore feel free to use them anytime during your school day.
Extra Practice Problems
Help students strengthen their application and fluency skills with daily word problem practice and content-aligned fluency activities.
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Sketch angles of specified measure using a 180° protractor.
Topic A: Lines and Angles
Identify and draw points, lines, line segments, rays, and angles.
Standards
4.G.A.14.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.54.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.
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.54.MD.C.64.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.14.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.
Identify and draw lines of symmetry in two-dimensional figures.
4.G.A.3
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