# Lines and Angles

by
**JMager4**

Last updated 6 years ago

** Discipline: **

Math ** Subject: **

Geometry
** Grade:**

4

Angles

Perpendicular Lines

~Angles and lines ate found everywhere in real life~angles and lines are the basis for understanding geometry~Careers such as architecture and engineering rely on knowledge about angles and lines~Understanding angles and how they work can even make you better at playing certain games

~Parallel lines never cross~Perpendicular lines always form right angles~Line segments are part of a line between two endpoints~Rays have one endpoint and go in one direction without stopping~Lines extend in both directions without stopping

Lines and Angles

Why ?

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Parallel Lines

CCSS.MATH.CONTENT.4.G.A.1Draw points, lines, line segments, rays, angles (right, acute, obtuse), and perpendicular and parallel lines. Identify these in two-dimensional figures.

Lines

Facts

~Straight angles are exactly 180 degrees-straight line, no bend~A right angle, which is also called a square angle is exactle 90 degrees and forms a square where the two lines meet.~An acute angle forms where two lines meet and is less than 90 degrees~An obtuse angle is more than 90 degrees but less than 180 degrees

Facts

Point

Common Core Standard

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Protractor: Used to measure angles

Use a ruler to draw straight lines

Angle Song

Parallel or Perpendicular Song

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