Bai tap gui chi THANH

Development and consolidation.
Exercise 1. Look at examples and make similar statements about the following.
Example:
• A square is a kind of rectangle, but not all rectangles are squares.
• A right-angled triangle is a kind of triangle, but not all triangles are right-angled.
a) rhombus; parallelogram
b) parallelogram; trapezium
c) isosceles triangle; triangle
d) isosceles triangle; equilateral triangle
e) rectangle ; plane figure
Exercise 2. Read the passages below and then complete the following sentences
• All the sides of an equilateral triangle are equal, and so are those of a rhombus
• Opposite sides of a parallelogram are parallel and so are those of a regular hexagon.
a) Opposite sides of a rectangle are equal, and so are
b) All the angles of a square are right angles, and so are
c) All the sides of a regular hexagon are equal, and so are
d) All the sides of an equilateral triangle
e) All the angles of an equilateral triangle
Exercise 3. Read and fill the gaps with the correct words.
In plane geometry an angle is a(6) that is formed by two
(7) lines that meet at a point. The lines of an angle are called the
(8) The point where they meet is called the (9) When the
sides of an angle are (10) to each other, they form a right angle. A right
angle (11) ninety degrees. An angle of less than 90
0
is
(12) acute angle, and an angle of more than 90
0
but less than 180
0
is an

(13) angle. An angle of more than 180
0
is a (14) angle.
Exercise 4. Read and fill the gaps with the correct words.
The Circle
A circle is a plane (1) figure. The side of a circle is (2) the circumference. All… …
the points on the (3) of a circle are equidistant from the (4) A straight line which is drawn…
from the (5) of a circle to (6) circumference is called a (7) All the radii of a circle are… … …
equal. The area between two radii is called a (8) . A straight line drawn between one part of…
the circumference and another is known as a (9) . A chord (10) a circle into two (11)… … …
and the circumference into two arcs. A chord (12) passes through the centre of a circle is…
called a diameter.
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Review lesson
Complete the following sentences, then translate them into Vietnamese.
1. Any angle that measures between zero degree and ninety degrees is called … …
2. A segment in a quadrilateral that is perpendicular to both bases, with endpoints on the base
lines is called
4. The parallel sides of a trapezoid are called …………………
5. The middle point of a circle or sphere is called ……………………
6. is the set of all points in a plane that are the same distance from a given point
called the center.
7. The distance around a circle is called …
8. Angles that hold the same position on two different parallel lines cut by a transversal (®êng
ngang) are called . ……
9. The distance across a circle through its center is called .……………………
10. A triangle that has three congruent sides is called an …………………………
11. The distance from the center of a circle to any point on the circle is called .……
12. The length of the altitude of a quadrilateral is called the .……………………………
13. In a right triangle, the side opposite the right angle is called the ……………………

14. A triangle that has two congruent sides is called an ………………………
15. Any angle that measures between 90
0
and 180
0
is called .…………………………
16. Lines that are in the same plane but do not intersect are called …………………………
17. A quadrilateral that has both pairs of opposite sides parallel is called ……………………
18 The distance around a geometric figure is called …………………………
19. One of the four regions into which two perpendicular number lines separate a plane is
called .……………………………………
20 A parallelogram with all angles congruent is a ……………………………
21. A parallelogram that has four congruent sides is called .……………………………
22. An angle that measures exactly ninety degrees is a ………………………………
23. A triangle with no congruent sides is often called a .)………………………
24. that have the same shape but may differ in size are similar.
25. Figures that can be folded into two identical parts are called ………………………………
26. A quadrilateral with exactly two parallel sides is a .…………………………………
27. The of a pyramid is the point where all the faces except the base intersect. .
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Đề kiểm tra học trình
I. Phần bắt buộc.
Đọc và điền từ thích hợp vào các câu sau.
1. A common of several numbers is a divisor of each of them.
2. In every of common divisors there is always a greatest common
divisor.
3. If we have to do with numbers, decompose each
into factors and write out those which are of all the
given numbers.
4. A common multiple of several numbers is a of each of them

5. The set of common multiples has a common multiple.
6. If the number is large, do as follows: factor the given numbers into
factors, write out all prime factors of at one of the given numbers;
then take each and raise it to the power that it is
contained in the given Then multiply.
II. Phần tự chọn. (Dịch 1 trong 2 bài sau sang tiếng Việt)
Bài dịch 1.
1. The value of a rational number is unchanged if both the numerator and denominator
are multiplied or divided by the same nonzero number.
2. The product of two or more rational numbers is a rational number whose numerator
is the product of the numerators and whose denominator is the product of the
denominators of the several factors
3. The quotient of two rational numbers can be evaluated by the use with the least
common denominator of the two numbers as the multiplier
4. The set of real numbers consists of the rational and irrational numbers. The real
numbers may be ordered by comparing their decimal representations
Bài dịch 2
1. Elementary mathematics is concerned mainly with certain elements called numbers
and with certain operations defined on them.
2. The unending set of symbols 1,2,3, 4, 5,6, 7,8, 9, 10,11, 12, used in counting are
called natural numbers.
3. In adding two of these numbers, say 5 and 7, we begin with 5 (or with 7) and count
to the right seven (or five) numbers to get 12. The sum of two natural numbers is a
natural number, that is, the sum of two members of the above set is a member of the
set.
4. In subtracting 5 from 7, we begin with 7 and count to the left five numbers to 2. It is
clear, however, that 7 cannot be subtracted from 5 since there are only four numbers to
the left of 5.
Từ mới:
decompose: phân

tích
rational: hữu tỉ concern: liên quan unending: bất tận
prime: nguyên tố evaluate: đánh giá certain: chắc chắn natural: tự nhiên
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power: luü thõa real: thùc define: ®Þnh râ clear: râ dµng
raise: n©ng lªn decimal: thËp
ph©n
count: ®Õm since: v× vËy
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