## Measuring Angles
12/14/2015
Unit Name: Measuring AnglesCommon Core State Standards:4.MD.6 Measure angles in whole-number degrees using a protractor. Sketch angles of specified measure.4.MD.7 Recognize angle measure as additive. When an angle is decomposed into non-overlapping parts, the angle measure of the whole is the sum of the angle measures of the parts. Solve addition and subtraction problems to find unknown angles on a diagram in real world and mathematical problems, e.g., by using an equation with a symbol for the unknown angle measure.Essential Vocabulary: lines angle point line segment ray vertex/vertices measure point end point geometric shapes ray angle circle fraction intersect one-degree angle protractor decompose addition subtraction unknown complementary angles Unit Overview:In this unit, students will be exposed to measuring angles for the first time. Angle measure is a "turning point" in the study of geometry. Students often find angles and angle measure to be difficult concepts to learn, but that learning allows them to engage in interesting and important mathematics. Students will learn that a circle is made up of 360 one-degree angles. Students will learn to reason usingcomplementary angles. They will utilize this information in order to decompose (break apart) angles into smaller angles. For example a 40 degree angle = 40 one-degree angles = 25 degree angle + 15 degree angle, etc. In addition, students will learn how to use a protractor as a tool within this unit. Strategies/Skills:Students will build on their understanding of geometric shapes and go further with identifying and measuring angles. Students will model mastery of this concept through the following ways: building drawing identifying analyzing Video Support:**Introduction to protractors**https://learnzillion.com/lessons/2907-introduction-to-protractors**Measure angles to the nearest 10 by reading a protractor**https://learnzillion.com/lessons/3010-measure-angles-to-the-nearest-10-by-reading-a-protractor**Measure angles to the nearest degree with protractor**https://learnzillion.com/lessons/2973-measure-angles-to-the-nearest-degree-with-protractors**Sketch angles that are multiples of 10 degrees using a protractor**https://learnzillion.com/lessons/2913-sketch-angles-that-are-multiples-of-10-degrees-using-a-protractor**Sketch angles that are not multiples of 10 degrees using protractor**https://learnzillion.com/lessons/3101-sketch-angles-that-are-not-multiples-of-10-degrees-using-a-protractor**Compose and decompose angles**https://learnzillion.com/lessons/3270-compose-and-decompose-angles**Understand that angle measure is additive by decomposing**https://learnzillion.com/lessons/3253-understand-that-angle-measure-is-additive-by-decomposing**Finding unknown angles using angle properties**https://learnzillion.com/lessons/3254-find-unknown-angles-using-angle-properties**Find unknown angles using diagrams**https://learnzillion.com/lessons/3402-find-unknown-angles-using-diagrams**Write an equation to solve for a missing angle measure**https://learnzillion.com/lessons/3403-write-an-equation-to-solve-for-a-missing-angle-measure
Questions to Ask When Helping Your Child with Math Homework Keep in mind that homework in elementary schools is designed as practice. If your child is having problems, please let the classroom teacher know. When helping your child with his/her math homework, you don’t have to know all the answers! Instead, we encourage you to ask probing questions so your child can work through the challenges independently. What is the problem you’re working on? What do the directions say? What do you already know that can help you solve the problem? What have you done so far and where are you stuck? Where can we find help in your notes? Are there manipulatives, pictures, or models that would help? Can you explain what you did in class today? Did your teacher work examples that you could use? Can you go onto another problem & come back to this one later? Can you mark this problem so you can ask the teacher for an explanation tomorrow?
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## Mrs. Ana RhyneI teach 4th grade math and science at Weatherstone Elementary School. I graduated from Meredith College with a BA in Spanish and K-6 licensure. ## Archives
May 2016
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