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Acute Angles Resources

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Acute angles, right triangles, and trigonometry Written by tutor Jessica G. An acute angle is one whose measure is less than 90 degrees. An acute triangle, therefore, is a triangle whose three angles each measure less than 90 degrees. An equilateral triangle is a specific type of acute triangle where the three angles have an equal measure of 180°/3 = 60°. A right angle, formed by... read more

Lessons

Introduction to Angles We begin our study of angles by learning what they are, how to name them, and ways in which angles can be classified. These concepts are explained below. Angle An angle is formed when two rays meet at a common endpoint, or vertex. The two sides of the angle are the rays, and the point that unites them is called the vertex. The vertices are shown... read more