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: Types of Lines
- Parallel lines: lines that are the same distance apart and never meet
- Intersecting lines: lines that cross each other or meet
- Perpendicular lines: lines that cross each other or meet and create L shapes or right angles where they meet
- Perpendicular lines are special types of intersecting lines
Lesson 2: Points, Lines, Line Segments, Rays
- Point: an exact location or position
- Line: a straight line that goes on forever from both ends
- Line Segment: part of a straight line that stops at both ends
- Ray: part of a straight line that stops at one end and goes on forever at the other end
Lesson 3: Angle Basics
- Angle: the space or shape formed between intersecting lines
- Right angle: an angle that contains a square corner created by perpendicular lines
- Acute angle: an angle that is smaller than a right angle
- Obtuse angle: an angle that is bigger than a right angle but smaller than a straight angle
- Straight angle: an angle that looks like a straight line
- An angle can also be described as two rays that share the same endpoint
- An arc or semicircle is used to identify acute, obtuse, and straight angles; a square identifies right angles
Lesson 4: Measuring Angles
- Degree: unit of measure for angles
- There are 360 degrees in a full circle
- A right angle is 90°, an acute angle is less than 90°, an obtuse angle is greater than 90° but less than 180°, and a straight angle is 180°
Lesson 5: Using a Protractor
- Protractor: a tool used to measure angles
Lesson 6: Playing with Angles
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Lesson 7: Adding Angles
- Adjacent angles: angles that share a common side and a common vertex
- The measures of adjacent angles can be added together to find the measure of a larger angle
Lesson 8: Special Triangles
- 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 equal
- Isosceles triangle: triangle with 2 sides and 2 angles equal
- Scalene triangle: triangle with no equal sides or angles
Lesson 9: What Is Symmetry?
- Symmetry (line or mirror): when one half of an object or image is the mirror image of the other half
- Line of symmetry: the line that divides a symmetrical object or image into two mirror images
- Symmetrical means an object or image has symmetry; asymmetrical means an object or image does not have symmetry
Lesson 10: Playing With Symmetry
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Lesson 11: Problem Solving
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Lesson 12: Unit Test
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Final Project: My Geometry Town
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