SALTA 4th grade

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Focus

Standards

Curriculum Supports – enVision 2020 Topic 15: Geometric Measurement: Understand Concepts of Angles and Angle Measurement

Vocabulary

Strand: Geometry Fourth grade students draw and identify lines and angles, as well as classify shapes by properties of their lines and angles. Standard 4.G.1 Draw points, lines, line segments, rays, angles (right, acute, obtuse), and perpendicular and parallel lines. Identify these in two-dimensional figures. Strand: Measurement and Data Fourth grade students understand various concepts of angles and angle measurement. Standard 4.MD.5 Recognize angles as geometric figures that are formed wherever two rays share a common endpoint, and understand concepts of angle measurement. a. Understand that an angle is measured with reference to a circle with its center at the common endpoint of the rays, by considering the fraction of the circular arc between the points where the two rays intersect the circle. An angle that turns through 1/3 60 of a circle is called a “one - degree angle,” and can be used to measure other angles. b. Understand that an angle that turns through n one-degree angles is said to have an angle measure of n degrees. Standard 4.MD.6 Measure angles in whole-number degrees using a protractor. Sketch angles of specified measure. Standard 4.MD.7 Recognize angle measure as additive. a. Understand that 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. b. Solve addition and subtraction problems to find unknown angles on a diagram in real-world and mathematical problems, for example by using an equation with a symbol for the unknown angle measure.

Topic 15:

4.G.1 4.MD.5 4.MD.6 4.MD.7

• point • line • line segment • ray • right angle • acute angle • obtuse angle • straight angle • degree • unit angle • angle measure • protractor • vertex

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Symphony Orchestras

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The Spirit of St. Louis

15-1 Lines, Rays, and Angles 15-2 Understand Angles and Unit Angles

15-3 Measure with Unit Angles 15-4 Measure and Draw Angles

15-5 Add and Subtract Angle Measures 15-6 Problem Solving: Use Appropriate Tools 3-ACT MATH: Game of Angles Topic 15 Manipulatives: • Clock Face • Pattern Blocks • Protractors • Centimeter grid paper • Centimeter ruler • Meterstick • Inch ruler • Yardstick