Прочитайте текст. ответьте на во после текста.

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.

Во

Аманда55573    1   11.05.2020 21:56    46