8. A. Discuss the following problems in your group using the following words and expressions. Give examples of the objects and phenomena from life.

1.The difference berween a rigid body and other bodies.3. The relation between force and pressure. 4. Equilibrum.

according to / as, it is known that / as, is defined as, is considered as, is formally regarded as, means, is dealt with is treated as, Is expressed by, s determined by, is calculated, is required, is called, is referred to as, is represented, is indicated by, is used, with respect to, due to, also, since, therefore, is applied / concentrated at a point, a line through the point, the line of action, number of forces considered col­lectively, concurrent, non-concurrent, intersect in a point, coplanar, noncoplanar, lie in a plane, the resultant of a system of forces, determine the resultant, is called composition, torque.

B. prepare a grawing or picture of a detail and demonstrate the phenomena described in the text.

9. Form the adjectives with the suffixes -able, -ible and use them

in the sentences.

Model. If you are able to read the book, the book is readable.

transfer, rely, compare, convert, intersect, apply, change,

allow, count, read, vary, reverse, neglect, prove, admit, solve.

10. Group the synonyms.

magnitude, cross, action, extent, application, regard, refer as,

determine, consider, call, use, intersect, value, define, represented, length, include.

11. A. Fill in the gaps.

1. We ____ that this property is true. 2. We will ____ the problem.

3. We are ____ the value of this function. 4. We have ____ the equation and

____the result. 5. We ____ that this set consists a unique element. 6. In order

_____such theorems with the help of axioms we use this result.

a. prove, b. determine c. state, d. calculate, e. suppose, f. consider,

g. check

1. _____ is drawn with two lines. 2. A perpendicular is a ____line put on the plane. 3. Circle is drawn as a closed _____. 4. In the _____of your drawing

you give your name. 5. A _____angle is less than 90°. 6. A _____ angle is

more than 90°.

a curve, b. obtuse, c. sharp, d. straight, i. angle, f. corner, g. perpendicular.

B. Use exercise A to complete the questions and answer them.

1. Can you____? 2. May I____?3. Why should I____? 4. What shall I ____? 5.Am I to ____? 6. Let us____? 7. Are you able to____? 8. Have I

to ____? 9.Would you, please____? 10. Will you____?

12. Word the mathematical symbols using the introductory words

given below.

Let …be equal to, Let us consider the problem. Let us admit / assume / imagine, suppose, provided, I state / argue that, Let us prove that, according to the expression, proceeding from the given.

1) a = b a equals b or a is equal to b. 2) a ≠ b a doesn't equal b or a isn't equal to b. 3) a A a belongs to A capital. 4) A A a doesn't belong to A capital. 5) A B A is contained in B. 6) B A B contains A. 7) A B A isn't contained in B. 8) a(B) a of B.