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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

www.mathsisfun.com/acute.html

www.khanacademy.org/math/geometry/hs-geo-foundations/hs-geo-angles/v/acute-right-and-obtuse-angles

www.mathopenref.com/angleacute.html

Try this Adjust the

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

In this lesson, you'll learn what makes an

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

When we start studying about geometry, we learn about lines and

www.reference.com/math/many-acute-angles-triangle-c78cf2cac098f4db

A triangle has either two or three

www.reference.com/math/examples-acute-angles-found-real-life-b6675d69ba111fef

A ramp forms an

mathworld.wolfram.com/AcuteAngle.html

etc.usf.edu/clipart/galleries/457-acute-angles

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:
www.ehow.com

More Info

www.mathsisfun.com

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

www.dictionary.com

www.virtualnerd.com

Note: Did you know that there are different kinds of