Geometry

Unit Review Sheet

Facts and Definitions

Lesson 1: Getting to Know Attributes

• Attribute: a characteristic of an object such as size, shape, color, or thickness

Lesson 2: Making and Naming Polygons

• Polygon: a closed, flat shape that is made up of three or more straight sides
• Triangle: a polygon that has three sides
• Square: a polygon that has four sides that are the same length
• Rectangle: a polygon that has 2 pairs of opposite sides that differ in length
• Pentagon: a polygon that has five sides
• Hexagon: a polygon that has six sides
• Heptagon: a polygon that has seven sides
• Octagon: a polygon that has eight sides
• Nonagon: a polygon that has nine sides
• Decagon: a polygon that has ten sides
• Dodecagon: a polygon that has twelve sides
• Circle: a closed, flat shape that has only one curved side

Lesson 3: Polygon Attributes

• Side: a line that makes part of a shape or polygon
• Angle: the space created inside a shape where the sides meet
• Vertex: the point where two sides of a shape or polygon meet
• Regular: a shape that has sides that are all the same length
• Irregular: a shape that has sides that are NOT all the same length

Lesson 4: Quadrilaterals

• Quadrilateral: a polygon that has four sides

Lesson 5: Shaping Up!

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Lesson 6: Fun With Tessellations and Tangrams

• Tessellation: a picture made up of a repeated pattern of shapes that fit together but do not overlap
• Tangram: a Chinese puzzle made of a square divided into seven pieces that are used to create images or designs

Lesson 7: Dividing Shapes

• Partition: to divide
• Half: one part of two equal parts that make a whole
• Third: one part of three equal parts that make a whole
• Fourth: one part of four equal parts that make a whole

Lesson 8: Solid Shapes

• 2-dimensional (2D): flat, "plane"
• 3-dimensional (3D): not flat, has three dimensions (height, width, depth)
• Cube: a 3D solid made up of 6 squares
• Cone: a 3D solid that has one base in the shape of a circle
• Cylinder: a 3D solid that has two bases in the shape of circles
• Prism: a 3D solid that has two bases — a flat top base and a flat bottom base — neither of which are in the shape of a circle
• Pyramid: a 3D solid that has one base that is not in the shape of a circle; it has a pointy top and a flat bottom base
• Sphere: a 3D solid that is shaped like a ball
• Face: a flat surface that makes up a solid or a polyhedron
• Edge: a straight line on a polyhedron where faces meet
• Polyhedron: a 3D solid made up of many faces
• Base: the "end" of a solid shape, determines the name of the solid (ex. a square pyramid has a square base)
• Vertex: corner or point where edges on a solid shape meet

Final Project: Playground Plans

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