Angles
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Right angle - Wikipedia, the free encyclopedia

Right angle - Wikipedia, the free encyclopedia | Angles | Scoop.it

In geometry and trigonometry, a right angle is an angle that bisects the angle formed by two halves of a straight line. More precisely, if a ray is placed so that its endpoint is on a line and the adjacent angles are equal, then they are right angles. As a rotation, a right angle corresponds to a quarter turn (that is, a quarter of a full circle).

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Angles - Acute, Obtuse, Straight and Right

Angles - Acute, Obtuse, Straight and Right | Angles | Scoop.it
Acute Angle an angle that is less than 90° Right Angle an angle that is 90° exactly Obtuse Angle an angle that is greater than 90° but less than 180° Straight Angle an angle that is 180° exactly Reflex Angle an angle that is greater than 180°
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Angle - Wikipedia, the free encyclopedia

Angle - Wikipedia, the free encyclopedia | Angles | Scoop.it

In geometry, an angle is the figure formed by two rays, called the sides of the angle, sharing a common endpoint, called the vertex of the angle. Angles are usually presumed to be in a Euclidean plane, but are also defined in non-Euclidean geometry.

Angle is also used to designate the measure of an angle or of a rotation. This measure is the ratio of the length of a circular arc by its radius. In the case of an angle (figure), the arc is centered at the vertex and delimited by the sides. In the case of a rotation, the arc is centered at the center of the rotation and delimited by any point and its image by the rotation.

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