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Mathematics

Space and shape

Educator section

Memorandum

  • (a) acute

(b) right

(c) obtuse

(d) straight

(e) reflex

(f) revolution

9.2

(a) 37°

(b) 128°

(c) 60°

(d) 90°

(e) 120°

(f) 87°

  • (a) equal in size

(b) The length of the lines has nothing to do with the size of the angles

.

  • NE : 048°

E : 090°

SE : 133°

S : 180°

12.3 C : 125° F : 070°

E : 250° K : 295°

W : 190°

12.4

Leaner section

Content

Activity: angels [lo 4.8, lo 4.9, lo 3.8]

9. LET US REVISE

When lines are joined, angles are formed.

9.1 Work in groups of three. See which group can state the kind of angle in each diagram!

.2 Estimate the sizes of the following angles. Then measure them carefully with your protractor and complete the table.

º

Angle Estimated Measured
a) 1 _____________ _____________
b) 2 _____________ _____________
c) 3 _____________ _____________
d) 4 _____________ _____________
e) 5 _____________ _____________
f) 6 _____________ _____________

9.3 Draw the following angles with the help of your protractor:

a) 49°

b) 97°

c) 196°

d) 216°

9.4 BRAIN-TEASER!

a) Which angle is the larger: a or b?

b)

_____________________________________________________________________

b) What have you realised? ___________________________________________

_____________________________________________________________________

_____________________________________________________________________

_____________________________________________________________________

9.5 REMEMBER!

The size of an angle is determined by the amount of rotation there is around the fulcrum.

λ POINT
A number of points together form a
LINE
Lines segments joined give
ANGLES
Angles joined together form
FIGURES

11. BRAIN-TEASER!

What is the smallest number of straight lines that can be used to join the dots below WITHOUT lifting up your pencil?

(Can you do it with three lines?)

12. ANGLES AND NAVIGATION

12.1 Did you know?

In navigation and aviation, direction is always determined in terms of the angle which is made by the route (clockwise) with the north line.

i.e. we measure in degrees, the amount of turning from north.

Line to the route in a clockwise direction.

The north line is 0˚.

A bearing is always indicated with three digits. A bearing of 26˚ is written as 026˚.

12.2 Look carefully at this magnetic compass. A compass needle always points to north. Now write down the following directions in degrees.

NE : ____________________

E : ____________________

SE : ____________________

S : ____________________

12.3 Study this radar screen which can be found on a boat. Write the direction of the following boats in degrees:

C : ____________________

E : ____________________

F : ____________________

K : ____________________

W : ____________________

Assessment

Learning Outcome 4: The learner will be able to use appropriate measuring units, instruments and formulae in a variety of contexts.

Assessment Standard 4.8: We know this when the learner classifies angles into acute, right, obtuse, straight, reflex or revolution;

Assessment Standard 4.9: We know this when the learner estimates, compares, measures and draws angles accurate to one degree using protractors.

Learning Outcome 3: The learner will be able to describe and represent characteristics and relationships between two-dimensional shapes and three-dimensional objects in a variety of orientations and positions.

Assessment Standard 3.8: We know this when the learner locates positions on co-ordinate systems (ordered grids) and maps.

Questions & Answers

Do somebody tell me a best nano engineering book for beginners?
s. Reply
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Devang Reply
are you nano engineer ?
s.
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Abhijith Reply
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Harper
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SUYASH Reply
for screen printed electrodes ?
SUYASH
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s. Reply
of graphene you mean?
Ebrahim
or in general
Ebrahim
in general
s.
Graphene has a hexagonal structure
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what's the easiest and fastest way to the synthesize AgNP?
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Cied
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abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
Porter
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Porter
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Yasmin
what is the function of carbon nanotubes?
Cesar
I'm interested in nanotube
Uday
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
AMJAD
preparation of nanomaterial
Victor Reply
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
Himanshu Reply
good afternoon madam
AMJAD
what is system testing
AMJAD
what is the application of nanotechnology?
Stotaw
In this morden time nanotechnology used in many field . 1-Electronics-manufacturad IC ,RAM,MRAM,solar panel etc 2-Helth and Medical-Nanomedicine,Drug Dilivery for cancer treatment etc 3- Atomobile -MEMS, Coating on car etc. and may other field for details you can check at Google
Azam
anybody can imagine what will be happen after 100 years from now in nano tech world
Prasenjit
after 100 year this will be not nanotechnology maybe this technology name will be change . maybe aftet 100 year . we work on electron lable practically about its properties and behaviour by the different instruments
Azam
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
Prasenjit
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Damian
silver nanoparticles could handle the job?
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not now but maybe in future only AgNP maybe any other nanomaterials
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I'm interested in Nanotube
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this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
Prasenjit
can nanotechnology change the direction of the face of the world
Prasenjit Reply
At high concentrations (>0.01 M), the relation between absorptivity coefficient and absorbance is no longer linear. This is due to the electrostatic interactions between the quantum dots in close proximity. If the concentration of the solution is high, another effect that is seen is the scattering of light from the large number of quantum dots. This assumption only works at low concentrations of the analyte. Presence of stray light.
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Source:  OpenStax, Mathematics grade 7. OpenStax CNX. Sep 16, 2009 Download for free at http://cnx.org/content/col11075/1.1
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