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andreykotov6
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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.

Во

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mikysya
mikysya
4,5(22 оценок)

-hello, jim!

-hello, sarah!

- what's the weather like there in new york?

-well, it's rather hot here in the afternoon, i shoud say.

-really? it's been raining here all day long.

-that's a pity, isn't it? how's the weather there in winter?

-i don't know.  i haven't been here in winter.

- okay, so long.

- bye! see you soon.

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