Angle
From Wikipedia, a free encyclopedia written in simple English for easy reading.
An angle is the space between two lines that meet each other. When two lines meet at a point, an angle is formed. The two lines are called the arms of the angle. The point they meet is called the vertex.
To measure the size of an angle, we use degree. Degree is a standard unit. Degree is denoted by the symbol '°'.
1/60 degree is called 1 minute (written as 1')
1/60 minute is called 1 second (written as 1")
[edit] Types of angles
An acute angle is an angle less than 90°. A right angle is an angle equal to 90°. An obtuse angle is an angle greater than 90°. A straight angle is an angle equal to 180°. A reflex angle is an angle greater than 180° but less than 360°.
Supplementary angles are two angles with the sum equal to 180°. Complementary angles are two angles with the sum equal to 90°.
We usually use a protractor to measure and draw angles.
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