1. Find equivalents:

2. Complete the sentences:

1. Geometry allows people.

2. Euclid laid down.

3. Triangles, squares, and pentagons represent.

4. A regular polygon has sides of … length and … angles of equal size.

5. A regular polygon will resemble a circle in case.

6. There are two kinds of polygon: the convex and the reentrant.

7. Angles are formed where.

8. One can measure an angle with the help of.

9. Angles are measured in units.

10. There are different kinds of angles such as.

11. A transformation is.

12. The main transformations are.

13. Such transformations as reflection, translation, and rotation change.

14. Isometries are.

15. Stretching increases the size of the figure along.

16. Shearing is similar to stretching but.

18. Topology is a modern branch of geometry that takes.

19. Topology grew out of attempts.

3. Answer the questions:

1. What can people do with the help of geometry?

2. Who was the founder of geometry?

3. What is a regular polygon?

4. What is the difference between convex and reentrant polygons?

5. How can one measure an angle?

6. What is the difference between obtuse and reflex angles?

7. How can we call a change in the position, size, or shape of a geometric figure?

8. What transformations do not alter the lengths of the sides or the area of the figure?

9. What does topology study?

10. What can be spatial puzzles used for?