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Angles

by admin · August 23, 2013

This entry explores the basics of angles. An angle shape, composed of two lines or rays diverging from a common point known as the vertex. There are various types of angles. All angles have a vertex where the two lines or rays are joined.
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In the figure above Point B is the is the vertex of the angle ∠ABC.

Types of angles

Altogether, there are six types of angle as listed below. Click on an image below to learn more about the specific angle.

Less than 90°	Between 90° and 180°	Exactly 90°
Exactly 180°	Between 180° and 360°	Exactly 360°

The table below gives an over view of the names, intervals, and measured units of the angles above.

Units	Interval
Name	acute	right angle	obtuse	straight	reflex	perigon
Turns	$(0,\tfrac{1}{4})$	$\tfrac{1}{4}$	$(\tfrac{1}{4},\tfrac{1}{2})$	$\tfrac{1}{2}$	$(\tfrac{1}{2},1)$	$1$
Radians	$(0,\tfrac{1}{2}\pi)$	$\tfrac{1}{2}\pi$	$(\tfrac{1}{2}\pi,\pi)$	$\pi$	$(\pi,2\pi)$	$2\pi\,$
Degrees	(0,90)°	90°	(90,180)°	180°	(180,360)°	360°

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