**TEK1.6 Geometry and measurement. The student applies mathematical process standards to analyze attributes of two-dimensional shapes and three-dimensional solids to develop generalizations about their properties.**

* The student is expected to:*

*(A) classify and sort regular and irregular two-dimensional shapes based on attributes using informal geometric language;*

*(B) distinguish between attributes that define a two-dimensional or three-dimensional figure [such as a closed figure with three sides is a triangle or a solid with exactly six rectangular faces is a rectangular prism] and attributes that do not define the shape [such as orientation or color] ;*

*(C) create two-dimensional figures, including circles, triangles, rectangles, and squares, as special rectangles, rhombuses, and hexagons;*

*(D) identify two-dimensional shapes, including circles, triangles, rectangles, and squares, as special rectangles, rhombuses, and hexagons and describe their attributes using formal geometric language [such as vertex and side] ;*

*(E) identify three-dimensional solids, including spheres, cones, cylinders, rectangular prisms (including cubes), and triangular prisms, and describe their attributes using formal geometric language [such as vertex, edge, and face] ;*

*(F) compose two-dimensional shapes by joining two, three, or four figures to produce a target shape in more than one way if possible;*

*(G) partition two-dimensional figures [such as circles and rectangles] into two and four fair shares or equal parts and describe the parts using words [such as "halves," "half of," "fourths," or "quarters"] ; and*

*(H) identify examples and non-examples of halves and fourths.*

**2-D Vocabulary**: *Plane shapes, sort, side, vertex, triangle, circle, rectangle, square (special rectangle), rhombus, hexagon*

* *3-D Vocabulary: *Solid figure, edge, vertex, face, sphere, cylinder, cone, flat surface, triangular prism, rectangular prism, cube (special rectangular prism)*