WHAT IS ANGLE
Angle is the combination of two rays with a common endpoint. The symbol for an angle is ∠. The corner point of an angle is called the vertex of an angle. The two straight sides of the angle are called arms of the angle.
The angles which are measured anticlockwise from the base are something we call as positive angles. The angles measured clockwise from the base are called as negative angles. The standard unit of measuring an angle is degree. It is denoted by °.
Acute angle: An angle that measures less than 90°
Right angle: An angle that measures exactly 90°
Obtuse angle: An angle that measures more than 90° but less than 180°
Straight angle: An angle that measures exactly 180°
Reflex angle: An angle that measures more than 180° but less than 360°
Full rotation: An angle that measures exactly 360
- ACCUTE ANGLE:An angle which is measuring less than 90 degrees is called an acute angle. This angle is smaller than the right angle (which is equal to 90 degrees). For example, ∠30o, ∠45o, ∠60o, ∠75o, ∠33o, ∠55o, ∠85o, etc. are all acute angles. Let us see some examples here to understand.
- RIGHT ANGLE:A right angle is an angle that measures exactly 90 degrees, or a quarter turn. It is one of three types of angles, based on the measurement of their sides.
- OBTUSE ANGLE:The definition of an obtuse angle in geometry states that an angle larger than 90° but less than 180° is called an obtuse angle. We can use a protractor and mark any angle between 90° and 180° to draw an obtuse angle.
- STRAIGHT ANGLE:In geometry, a straight angle is an angle, whose vertex point has a value of 180 degrees. Basically, it forms a straight line, whose sides lie in opposite directions from the vertex. It is also termed as “flat angles”
- REFLEX ANGLE: A reflex angle is an angle that is more than 180 degrees and less than 360 degrees. For example, 270 degrees is a reflex angle. In geometry, there are different TYPES OF ANGLE such as acute, obtuse and right angles, which are under 180 degrees.
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