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 A line in geometry is always a straight line. When two straight lines meet at a point, they form an angle. The lines are called sides or rays of the angle, and the point is called the vertex. The symbol for angle is < .
 Angles are usually measured in degrees. An angle of 30 degrees, written 30°, is an angle whose measurement is 30 degrees.
 When two lines intersect, four angles are formed. The angles opposite each other are called vertical angles and are equal to each other.
 a and с are vertical angles. < a = 
 b and d are vertical angles. < b = 
 A straight angle has its sides lying along a straight line. It is always equal to 180°.
 <В is a straight angle.
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							Прочитайте текст. ответьте на во после текста. A line in geometry is always a straight line. When tw...
							 
 
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