## Chapter 6: 2-D and 3-D Geometry

## Common Core 3rd Grade Geometry Standards

**Teaching Resources:**

3rd Grade Math Common Core Content Standards with Exemplar Problems

Illustrative Mathematics Gr. 3 Content Standards with Exemplar Problems

## Everyday Math Unit 6: Geometry Lessons

**6.1 Investigating Line Segments, Rays, and Lines**: Describe line segments, lines, and rays; Draw and identify points, line segments, rays, and lines; Explore the diagonals of polygons. Vocabulary: line segment, endpoint, ray, arrowhead, line; Symbols for line, line segment, and ray.

**6.2 Parallel and Intersecting Line Segments, Rays, and Lines**: ID line segments, lines, and rays; ID parallel and intersecting lines, line segments, and rays; Model and draw parallel and intersecting pairs of lines, line segments, and rays; Model geometric figures; Vocabulary: parallel, intersect.

**6.3 Angles and Turns:**ID right angles in objects; ID the vertex and ides of an angle; Describe angles as full, half-, and quarter- turns. Vocabulary: clockwise, full turn, half-turn, quarter-turn, angle, vertex, side, clockwise (right turn), counter-clockwise (left turn), right angle; Symbols for angles, turns

**6.4 Triangles:**Use points to label and name triangles; Connect pairs of points with line segments; ID right angles; Use straws and twist ties to model triangles; ID the vertices and sides of a triangle; Vocabulary: triangle, side, vertex, vertices, angle, equilateral triangle, right triangle; Symbols: right angle, degree

**6.5 Quadrangles:**ID right angles and parallel and intersecting sides of quadrangles; Draw and name quadrangles; Use straws and twist ties to model and compare quadrangles; ID the sides, vertices, and adjacent sides of quadrangles; Measure the sides of a quadrangle; Vocabulary: quadrangle; square; rhombus; parallelogram; rectangle; trapezoid; adjacent sides; kites

**6.6 Polygons: Use points to name polygons; Use a straightedge to connect pairs of points; ID and name polygons; Explore the relationship between number of sides and angle measure; Estimate the perimeter of a polygon; Vocabulary: polygon; plane figure; regular polygon**

**6.7 Drawing Angles: Use straws and twist ties to model angles; Use quarter-turns to describe right angles; ID the vertex and sides of an angle; Model, draw, and name angles in terms of turns; Vocabulary: rotation, vertical**

**6.8 Measuring Angles: Determine fractional parts of a circle; ID quarter turns and 90 degree turns as measures of right angles; Investigate the degrees of a circle; Introduce the degree as a unit of measure for turns; Vocabulary: degree; Symbols: degree**

**6.9 Symmetry:**ID equal parts of shapes; Draw line segments to connect points; Draw missing parts of symmetric figures; Locate lines of symmetry in 2-D shapes; Vocabulary: symmetric, symmetry, mirror image, line of symmetry; Symbol: line of symmetry

**6.10 Exploring Congruence, Line Segments, and Decimals:**Model decimals; Read and write decimals to hundredths; Draw line segments to connect points; Compare polygons; Vocabulary: congruent; Symbols: decimal point

**6.11 Polyhedrons, Part 1:**ID parallel faces on prisms; Distinguish between 2- and 3-dimensional shapes; ID the faces of a polyhedron; ID, compare, and contrast the characteristics of 3-dimensional shapes; Vocabulary: pyramid, triangular prism, rectangular prism, cone, sphere, 3-dimensional (3-D), 2-dimensional (2-D), apex, polyhedron, face, edge, vertices, bases of a pyramid, parallel, base of a prism

**6.12 Polyhedrons, Part 2:**Compare faces on a prism; ID the faces of polyhedrons; ID and name prisms; ID the faces, edges, and vertices of prisms; Vocabulary: rectangular prism, triangular prism, hexagonal prism

**6.13 Unit Test**: ID and draw points, intersecting and parallel line segments, and lines, rays, and right angles; ID and describe plane (2-D) and solid (3-S) figures; Locate lines of symmetry and complete 2-D symmetric designs; Model decimals through hundredths; Order decimals through hundredths; Use equal sharing to model division

## Online Geometry Practice

Quadrilaterals:Read about quadrilateralsInteractive Quadrilaterals activity Quadrilateral Sorter activity IXL Classifying Quadrilaterals Quadrilateral Quest |
Triangles:Measuring Angles an online practice activity with a protractor Angle Measuring and Problem Solving game Angles Measuring Star Gazing game Angle Measuring practice with an online protractor Lines, line segments, and rays examples Naming lines, line segments, and rays practice Naming lines, line segments, and rays worksheet Angles meta site |
Polygons:Polygon Sort online game Polygon Matching game 2-D and 3-D shape review 2 and 3 D shape interactive reference |

Symmetry:Symmetry Game Drawing Lines of Symmetry Reflective Symmetry 2 activities Sammy's Symmetry Shuffle create symmetrical shapes Symmetry Artist blend art and math Kaleidoscope Painter make symmetrical art Snowflake Creator Congruent Shapes activity Create Something Symmetrical |
Geometry References:Geometry Symbols website Visual Online Math Dictionary check here to see geometric shapes and terms Visual Mathematics Dictionary check here to see geometric shapes and terms Math Dictionary for Kids check here to see geometric shapes and terms Math Visual Dictionary- great for "seeing" geometry vocabulary |
Miscellaneous:Maths Interactive Shape GamesGeometry in Architecture pageGrid and Dot paper resource K-3 Math Games meta site |

## Everyday Math Geometry Activities

Your child will investigate the following 2-D and 3-D geometric properties: line segments, rays, and lines; parallel and intersecting lines, line segments, and rays; angles and turns; triangles and quadrangles; polygons, drawing and measuring angles; symmetry and congruency; and polyhedrons. Your child will also review previous skills such as: addition and subtraction for accuracy and fluency; single-digit multiplication facts for accuracy and fluency; perimeter and area; and place value and decimals.

Unit 6 Home Links- print Home Links for extra practice of past lessons, or if you lose yours.

Teacher created website by Everyday Math unit- see unit 6

Sample Unit 6 test review- geometry

Unit 6 Home Links- print Home Links for extra practice of past lessons, or if you lose yours.

Teacher created website by Everyday Math unit- see unit 6

Sample Unit 6 test review- geometry