Simple closed figures

Geometry studies figures in the … and on the … . The main geometric notions are the … of a point and a line. A point is an exact … in space. A line consists of … of points. Lines form line …, rays and angles. A line segment includes … and all points … them. A ray is a line segment extended in one … .

Drawing two … originating from the same endpoint we get an … . The common point of the two rays is the … of the angle. Angles separate the plane into three distinct … of points: interior, …, and the angle. The letter naming the vertex of an angle is the … letter in naming of each angle.

A … angle has a measure of 90°. An … angle has a degree measure less than 90°. An … angle has a degree measure greater than 90°.

A simple closed figure is any figure drawn in a … in such a way that … never crosses or intersects itself and encloses … of the plane. Every simple closed figure … the plane into three distinct sets of point. The … of the figure is the sets of all points in the part of the plane enclosed by the figure. The … of the figure is the set of point in the plane which are outside the figure. And finally, the simple … figure itself is still another set of points.

A simple closed figure formed by line segments is called a …. Each of the line segments is called a … of the polygon. Polygons may be classified according to the … of the angles or the measure of the … . Triangle can be … . The sides of such triangle all have the same linear measure. An … triangle has two sides of the same measure. A right triangle has … right angle. A right triangle has two … and a …. A hypotenuse is a side opposite to the … angle.

A parallelogram is a quadrilateral whose opposite sides are …. So the set of all parallelograms is a … of all quadrilateral. A trapezoidal has only two parallel … . They are called the … of a trapezoidal.

Task 8

Fill in the gaps:

Problems of Cosmic and Cosmetic Physics

L. Meitner was ___ 1 _____woman – physicist in Germany. The title____ 2 ____her dissertation seemed absurd to one of the____ 3 ____. In his article______ 4 _____ L. Meitner which he _______ 5 ____in a newspaper he ___ 6 ____the title and ____ 7 _____ "Problems of Cosmetic Physics". L. Meitner only ____ 8 _____and ____ 9 ______this a ___ 10 ____ joke.

1. a. one 2. a. to

b. first b. for

c. the first c. on

d. the one d. in

3. a. magazines 4. a. about

b. journalists b. through

c. articles c. at

d. stories d. according

5. a. is publishing 6. a. corrected

b. was publishing b. drew

c. published c. asked

d. publishes d. talked

7. a. said 8. a. laughed

b. wrote b. is laughing

c. went c. has laughed

d. brought d. was laughing

9. a. is calling 10. a. fun

b. was calling b. funny

c. will call c. more funny

d. called d. more fun

Task 9

Can you help with geometry test?

Task 10

Now read the text and solve the problems.