EXERCISES:
1. Read the following words paying attention to pronunciation:
acute, obtuse, turn, complementary, reflex, pointed, represented, vertex, right.
2. Give words of the same root: form, contain, measure, term, notice.
3. Answer the following questions:
1. When is an angle formed?
2. What do we call a point at which the sides of an angle meet?
3. What unit is used in measuring an angle?
4. What angles do you know?
5. How many degrees does an acute angle contain?
4. Express agreement or disagreement with the following:
1. The right angle consists of more than 90.
2. An angle is formed by three straight lines.
3. An obtuse angle is greater than a right angle but smaller than straight angle.
4. The angles are called complementary when two angles put together form a straight angle.
5. If one side of an angle turns less than a quarter of a circle away from the other side, the angle that is formed is an acute angle.
5. Ask questions for these answers:
1. An angle is formed by two straight lines.
2. The point of meeting is called the vertex of the angle.
3. The unit of measurement of an angle is the degree.
6. Make up sentences of your own using words and expressions given below:
is said to be, is called, is formed, to depend upon, to turn away from, is less than, is more than, a degree, a circle, to turn more than a quarter.
7. Translate into Russian.
The size of measure of an angle is determined by the amount of opening between the sides, and not by the lengths of the sides. Two angles are said to be equal if they can be placed together so that their vertexes are at the same point and the two sides of one coincide with the two sides of the other, when several lines meet at one point to form more than one angle, any two of the angles which have one side in common are said to be adjacent.
When a line is drawn through the vertex of an angle between the sides it is said to divide the angle.
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