Geometry
Unit Review Sheet
These facts and definitions should be mastered throughout this unit. This page can be used for periodic review and study as you are finishing the unit and in the future.
Facts and Definitions
Lesson 1: Polygons and Their Parts
- Side: a line that makes part of a shape or polygon
- Vertex: the point where two sides of a shape or polygon meet or intersect
- Angle: the space created inside a shape where the sides meet or intersect
- Polygon: a closed, plane (2D) shape that is made up of three or more straight sides
- Regular polygon: a polygon whose angles all have the same measure and whose sides all have the same length
- Irregular polygon: a polygon that has angles or sides that are not the same size
- Congruent: same, equal (that is, congruent sides are the same length and congruent angles have the same measure)
Lesson 2: Identifying and Classifying Polygons
- Quadrilateral: a polygon that has 4 sides, 4 angles, and 4 vertices
- Square: a quadrilateral with 4 right angles and 4 congruent sides
- Rectangle: a quadrilateral with 4 right angles, and each pair of its sides is parallel and congruent
- Rhombus: a quadrilateral with 4 congruent sides, two pairs of parallel sides, and congruent opposite angles
- Parallelogram: a quadrilateral whose opposite angles are congruent and whose opposite sides are parallel and congruent
- Trapezoid: a quadrilateral with only one pair of parallel sides
- Kite: a quadrilateral with two pairs of congruent adjacent sides
- Pentagon: a polygon that has five sides
- Hexagon: a polygon that has six sides
- Octagon: a polygon that has eight sides
- Triangle: a polygon that has 3 sides, 3 angles, and 3 vertices
- Right angle: the square corner created by perpendicular lines (measures 90 degrees)
- Acute angle: an angle that is smaller than a right angle (less than 90 degrees)
- Obtuse angle: an angle that is bigger than a right angle (greater than 90 degrees but less than 180 degrees)
- Acute triangle: triangle with all angles less than 90 degrees
- Right triangle: triangle that has one right angle
- Obtuse triangle: triangle with one angle that is more than 90 degrees
- Equilateral triangle: triangle with all sides and angles congruent
- Isosceles triangle: triangle with 2 congruent sides and 2 congruent angles
- Scalene triangle: triangle with no congruent sides or angles
- Concave polygon: a polygon that has at least one vertex that points inward
- Convex polygon: a polygon in which all vertices point outward
Lesson 3: Graphing Review
- Pictograph: a graph that uses symbols or pictures to show amounts
- Bar graph: a graph that uses rectangular bars to show amounts
- Line plot: a graph that shows the frequency of data along a number line
Lesson 4: The Coordinate Plane
- Space: the area in which objects can be found
- Coordinates: 2 numbers that define the position of a point on a plane
- Axis: a reference line on a graph that is used to measure distances
- X-axis: line that runs left-right or horizontally on a graph
- Y-axis: line that runs up-down or vertically on a graph
- Origin: the point where the x-axis and the y-axis cross at 0; its coordinates are (0, 0)
- Coordinate plane: a two-dimensional plane formed by the x-axis and the y-axis
- Ordered pair: a pair of coordinates written in special order, horizontal first and then vertical; for example, (3, 5) means 3 to the right and 5 up
Lesson 5: Ordered Pairs
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Lesson 6: More Work With Ordered Pairs
- A line graph is a graph on a coordinate plane where data points are plotted and then joined together with straight lines.
Lesson 7: Coordinate Plane Pictures
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Lesson 8: Unit Review and Test
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Final Project: The ABC's of Geometry
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