Angles, Perpendicular and Parallel Lines

Matthew John, Apr 16, 2024

Table of Contents

  1. Angles
    1. Identifying Angles Around Us
    2. Naming Angles According to Their Size
  2. Perpendicular Lines and Parallel Lines
    1. Perpendicular Lines - Quick Intro
    2. Drawing perpendicular/parallel lines on square grid
    3. Drawing Parallel, Perpendicular, and Intersecting Lines

1.

Angles

  • 1. Identifying Angles Around Us
  • 2. Naming Angles According to Their Size

1.1.

Identifying Angles Around Us

Identify acute, right, obtuse, and straight angles while exploring everyday objects in this interactive activity.
Putting It All Together
[i]Answer these open ended questions on your own or with others to form deeper math connections. [/i]
Look around the area where you are sitting. Identify a type of angle you see and describe where you see it.
– GeoGebra Content Team

1.2.

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2.

Perpendicular Lines and Parallel Lines

Perpendicular lines are two lines that intersect at a 90-degree angle, forming right angles where they meet. Parallel lines are two or more lines that never intersect, no matter how far they extend. They always maintain the same distance apart from each other. If you were to extend parallel lines indefinitely in both directions, they would never cross.

  • 1. Perpendicular Lines - Quick Intro
  • 2. Drawing perpendicular/parallel lines on square grid
  • 3. Drawing Parallel, Perpendicular, and Intersecting Lines

2.1.

Perpendicular Lines - Quick Intro

[color=#1e84cc][b]WARM UP: [/b][/color][br][br]In the applet below, the [color=#9900ff][b]purple line[/b][/color] and the [color=#980000][b]brown line[/b][/color] are said to be [b]perpendicular lines[/b]. [br][br]Move the white points around a bit, then answer the question that appears below the applet.
Perpendicular Lines
Question:
[b]What does it mean for two lines to be perpendicular? [br][/b][br][color=#0000ff]Without looking up the definition on another tab in your browser, write a sentence definition in the response box below. [br][br][i]Be specific in your description! [/i][br][/color]
– Aniela Huizenga, Tim Brzezinski

2.2.

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2.3.

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Information