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  1. Straight (or Flat) angles are formed when the legs are pointing in exactly opposite directions. The two legs then form a single straight line through the vertex of the angle. The measure of a flat angle is thus always 180° Types of angle Altogether, there are six types of angle as listed below.

  2. Acute angle: angle measuring less than 90° Right angle: angle measuring exactly 90° Obtuse angle: angle measuring more than 90° Definition of an Acute Angle. Any angle that measures greater than 0° and less than 90° is called an acute angle. ∠ABC measures 30° and hence it is an acute angle. Examples of Acute Angles. Acute angles measure ...

  3. The legs (sides) of an angle are the two lines that make it up. In the figure above, the line segments AB and BC are the legs of the angle ∠ ABC. Interior: The interior of an angle is the space in the 'jaws' of the angle extending out to infinity. See Interior of an Angle: Exterior: All the space on the plane that is not the interior.

  4. A 180-degree angle is a straight angle and it is exactly half of a revolution. It is also called a half-circle angle. A straight angle is produced by a straight line. The two arms of the angle which are making 180-degree are just opposite to each other from the common vertex. A 180-degree angle modifies the direction of a point.

  5. › geometry › exterior-anglesExterior Angle - Math is Fun

    Exterior Angle The Exterior Angle is the angle between any side of a shape, and a line extended from the next side. Another example: When we add up the Interior Angle and Exterior Angle we get a straight line 180°. They are "Supplementary Angles".

  6. An acute angle is the smallest angle measuring between 0 to 90 degrees, whereas the obtuse angle measures between 90 and 180 degrees. The right angle is exactly equal to 90 degrees. Apart from these, there are three other types such as straight, reflex and full rotation.

  7. Central angle is the angle subtended by an arc of a circle at the center of a circle.The radius vectors form the arms of the central angle. In other words, it is an angle whose vertex is the center of a circle with the two radii lines as its arms, that intersect at two different points on the circle.

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