right angle
A 90 degree angle
A right angle is an angle that measures exactly 90 degrees. It can be formed by two perpendicular lines or one line intersecting another line at a right angle. A right angle is an important concept in geometry and has many practical applications, including in architecture, engineering, and construction. In trigonometry, the sine, cosine, and tangent of a right angle have special values, making it a key angle in this field as well. The symbol for a right angle is a small square at the vertex of the angle.
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