1971-09-12 — Page 10

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日期星日二十月九年一七九一曆公年十六國三牶中門教僑華

The coordinate system.

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業同學

暑期進修專欄

小學畢業同學暑期進修專欄

the

智慧出版社主編

be the

楚出版社主

shall ca

英文數學

(十五)

新數學

(十六)

·A!

1ine

Kentas Kedern Mat tica

EXERCIR

Lesson

area of a wall "90"

Find the breadths and perimete

ful kiming regt ängitas

(b) Arka se dengts

Jeff uncauered.

Find the total area of the four antis, or

Visit parameter of a rectangle 15 in..

one of it's questis 10 in. find its area (6) theres and the length of rectangle Care 1,200 sq. ft. and Bud, respectively. Find is breadth

*(2). The perimeter of a square is 10-

16 area,

Piny

*(8) 11 the safea of a rectangle is 102 Pong chie

and chemits sides. 16 17-gnueh, find the periteter of the reve

The area of

"

chek Anven

(9)

Tone

Numbere

Use of Negative and positive numbers

According to what we have learned in the prev

lessons, we see that numbers have signs which shows direc

lon. Therefore It is easy to understand that numbers

can be used for snowing directi

Examples

The fire on the right hand side.

and emerged out from the, đẻa.

3-level is taken

be called the axis.

the horizontal line passi

origin is called the Y-axie wle

che vertical line passing the grigi

Is the

ince the

the

.Lines.

give numbers to

the axes. To the

the

of the y-axis, we put possitive numbers starting

ut down negetive numbers

the left

strating from

Above the x-axis, runters are also put on the

Ilne intersections at the

Below the x-axis,

The

Find the areas of

All cornerware

Then

agetive num

on the y-axis.l

As like the figure a

above,

A house at 120 feet above, the

sea level is regarded to be

120 feet

Bea at

to ba ne

written as 12ort

ship sunken at the bottom

60 feat below sea-level 19.

tive: 60 fæet Or: -60 ft.

It is understood that positive numbers

thtubove -level

Way of locating a pointi

Any point of the plane can be located

distance from both the x-axis and the y-axl

From above figure, No see that

2 units from I-zxis and 3. units from

EXERCISE (?

will represent the

negative, number

rasant distance below

Find the res the

par

7) the area of

[Ang]

square incher Arou

a) How many utimur Mudren of wide inches.

The out, but #ron » schvat v street fól detal

kaené varasto

(9). The per meter af

•((b) The lures

quary to

Find Its

tong cheunp 25 fon

chek and the, Length, at thđờ

rat îhi tengah setentang Lt;

sm width list te

1) the area of a friggse to

beigti Jave inches. Find its

kur the area of a rectangle is

perimeter

Brid

angular sheet

(14)

CHAPTER FIFTEEN

VOLUMES

Bread

Side

I've m * rectangular tank 19 640 cu.

gho Ain" night, find the length. SOLUTION

ANSWER

Ea amp?

·Find the

SOLUTION ANSWER

Since Length Volume Hideh Therefore, the required length:

the required length 16 7 uni

Height x

une of a cube whose edge la

The required folume

11: 11 cu. ini

volume, is 1:331 .cu. Lai

tamps

SOLUT

rube Ls 27 cubic inches. Find the area of one face

the volume of a cube 15 27 cù, Paña

red area of one face.

The required area of one face is

Tuo cuble ties of a liquid weighing 65 lb, por eu, (3, are GLACJ

sun d'eu, fr, of another fignad weighing 50 lb. per cu.

11. there is do change of volume, how much does | cu. ft

SOLUTION

ANSWER:

kampi

The requ red weight of 1, cu. a bi the mixcure

80 15:

The inquired weight of the mixture to 80 lb. per cur

sundra -

inches will be needed to make a quee

cher

Another daily.

is the sca

On the thermometer, the fee

(in the Celsius Scale

Any mise

legres while the

sint zieza tive

of tem

25

tes above the

means that the

below the freezing

Use of numbers to locat

Point B

units from the x-axis and 3 titss

from the Y-X15;

Ordered Pairs

To simplify the above long sentences, we use Just

bracket and two numbers. Futting them together, wek

a braket known as an ordered pair.

Thus point A can now be expressed as ( 3,2)

point B can no be express#

as (3, -2

Interchangin

It is a tradition to write the distance from the

xie first in an ordered pair

numbers will have complete dif

t meanings.)

lways use ordered taira to

Other than using to indica te

numbers can also be used. to show pós

When Tumbers are used to.

positions

ways refer to a twork -known as the coordinate

Co-creinate system

Ordered pairs in daily life

In dafly

positionst

The following.

الذياء

a seating pla

coorina

system is a network:

lly spaced parallel lines as sh

AAAA

SOLUTION

Vertical lines

Coordinate Network

îhe required number of cubes

120 12412) cum in (3x3x 3), ca..

number of cubes, is 64.*

EXERCISE 18

MARKS

DATE

Foom 18 fr

and th ach f

HI O D

show

0003

is. assign

Tow Hubes and ne

is at

seat is At Tow

them to find.

Find

fect, os aut

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