Geometry 1 st Grade Geometry Lesson

Content Strand Addressed Geometry Strand Students will: use visualization and spatial reasoning to analyze characteristics and properties of geometric shapes; identify and justify geometric relationships, formally and informally

Geometry Content Strand 1 st Grade 1.G.1 Match shapes and parts of shapes to justify congruency 1.G.2 Recognize, name, describe, create, sort, and compare two- dimensional and three-dimensional shapes 1.G.3 Experiment with slides, flips, and turns of two-dimensional shapes Geometry 1.G.4 Identify symmetry in two-dimensional shapes

Process Strands Addressed Communication Strand Students will: communicate their mathematical thinking coherently and clearly to peers, teachers, and others use the language of mathematics to express mathematical ideas precisely. Connections Strand Students will: recognize and use connections among mathematical ideas; recognize and apply mathematics in contexts outside of mathematics. Recognize and apply mathematics to objects, pictures, and symbols Representation Strand Students will: create and use representations to organize, record, and communicate mathematical ideas; use representations to model and interpret physical, social, and mathematical phenomena.

Vocabulary Between Next to, beside Far from/near Above/below Right/left Lines-horizontal; vertical perpendicular; parallel Angle formed by two rays or two line segments with a common end point. Plane –flat Parallel lines - lines in the same plane that are always the same distance apart - that do not cross. Similar – same shape – not necessarily the same size Congruent – having exactly the same size and shape. Dimensions the size and shape of an object. For example: length, width, height, etc. 2 Dimensional – 2 planes 3dimensional – 3 planes Solid—three-dimensional; not flat Face—flat surface of a three-dimensional figure

Objectives Recognize and describe geometric shapes Describe and compare attributes of two- dimensional shapes. Identify, describe, and classify two- dimensional shapes and three dimensional forms

Geometry Tell students they will be studying a certain kind of mathematics called geometry. Also tell them that they already know a lot about geometry and that they are going to learn the official mathematical terms for some of the things that they know.

Shapes Triangle - A plane figure having three angles and three sides. Square - A plane figure having four equal sides and four right angles. Rectangle- A four sided plane figure with four right angles. Circle - a round figure bound by a single curved line where each point is equally distant from the center of the circle. Ellipse

Symmetry similarity of form or arrangement on either side of a dividing line.

3 Dimensional Shapes Cube - a three-dimensional figure with six square faces. Sphere- a three-dimensional round body tetrahedron- a three-dimensional object with faces in the shape of a triangle

A Face is a flat surface of a three-dimensional figure Vertex In a three-dimensional object, the Vertex is the point where two edges intersect or meet. Edges are where the faces in a three- dimensional figure meet.

2 Dimensional and 3 dimensional FUN (Really an assessment) file:///Users/alisonfricke/Downloads/castle_shap es/Introduction/StarterActivityPart2.htm file:///Users/alisonfricke/Downloads/castle_shap es/Introduction/StarterActivityPart2.htm cymru.org.uk/vtc/build_it/eng/Introduction/defa ult.htm cymru.org.uk/vtc/build_it/eng/Introduction/defa ult.htm cymru.org.uk/vtc/castle_shapes/eng/Introductio n/default.htm

Assessment What shapes have no sides and no corners? What shape has four sides ? Name a shape with a square face.