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en.wikipedia.org/wiki/Angle

In planar geometry, an angle is the figure formed by two rays, called the sides of
the angle, .... Angles smaller than a right angle (less than 90°) are called

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Angles - Acute, Obtuse, Straight and Right · Twitter StumbleUpon ...

study.com/academy/lesson/what-is-an-acute-angle-definition-description-examples.html

In this lesson, you'll learn what makes an

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Try this Adjust the

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A ramp forms an

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Note: Did you know that there are different kinds of

math.tutorvista.com/geometry/acute-angle.html

There are different types of angles. On the basis of measures, angles can be
classified into following - (1)

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The

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1; 2. The

Answer

How to Calculate Acute Angles

A right triangle is any triangle with a right, or 90-degree, angle. Because the angles in a triangle must total 180 degrees, the remaining two angles are acute, which means they are less than 90 degrees. Trigonometry primarily concerns itself with...
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Difficulty:
Moderately Easy

Source:
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In One Diagram. This diagram might make it easier to remember: Also:

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