1. Drawing an angle:Requirements: pencil, ruler, protractor.
1.1 Always begin by drawing a base line.
1.2 Make a mark, e.g. on the left, and position the protractor on the mark.
1.3 Read your protractor from 0°.
1.4 In the case of an angle that is larger than 180°, the relevant angle size must be deducted from 360° before it is drawn. The angle around the outside (the reflex angle) is the angle that you will have to draw.
E.g. 320°: (360° – 320° = 40°). Draw a 40°angle. The reflex angle now represents the 320°.
2. Construct the following angles and name each one:
A$\stackrel{\u02c6}{B}$C = 75°
Type of angle:
2.2
C$\stackrel{\u02c6}{D}$E = 135°
Type of angle:
2.3
F$\stackrel{\u02c6}{G}$H = 215°
Type of angle:
3. Constructing a triangle:
Requirements: pencil, ruler, protractor and pair of compasses.
Always begin by making a rough sketch.
Then use one of the sides of which the length is provided as a base.
E.g. construct
$\Delta $ABC with
BC = 40 mm,
$\stackrel{\u02c6}{B}$ = 70° and
$\stackrel{\u02c6}{C}$ = 50°.
Rough sketch:
To measure a lateral length accurately, you must measure the length on you ruler with the help of a pair of compasses. Then the compass point must be positioned on
B and the position of
C must be indicated with a pencil mark.
Construction:
4. Construct each of the following triangles:
4.2
$\Delta $PQR with
QR = 58 mm,
P$\stackrel{\u02c6}{Q}$R = 62° and
Q$\stackrel{\u02c6}{P}$R = 69°.
Measure:
PQ = mm
$\stackrel{\u02c6}{R}$ =
4.2 Isosceles
$\Delta $ABC with
BC = 42 mm,
AB =
AC and
$\stackrel{\u02c6}{B}$ = 63°.
Measure:
a) PQ = mm
Activity 2
Bisecting any given line or angle
[lo 3.4, 3.5, 4.7]
Bisecting a given line
AB :
Measuring line segment
AB (e.g. 40 mm).
Using a pair of compasses, measure slightly more than half of the line(i.e. ± 22-25 mm).
Position the point of the pair of compasses on
A and make a pencil stroke below and above the line.
Position the point of the compasses on
B and draw another pencil stroke above and below the line.
Connect the intersections of the pencil strokes.
Name the point on line
AB ,
P. P is the centre of line
AB .
2. Now try the following:
Draw line segment
PQ = 70 mm.
Bisecting line segment
PQ , as in nr. 1 explained.
3. Bisect π
ABC :
Place the point of the pair of compasses on
B .
Draw an arc of any size as indicated.
Position the point of the compass on the point where the two lines intersect and draw pencil lines inside the angle.
Position the point of the compass on the other point of intersection and draw a line inside the angle, so that the two lines intersect.
Connect
$\stackrel{\u02c6}{B}$ (angle
B ) with the point where your pencil lines intersect.
$\stackrel{\u02c6}{B}$1 will have the same size as
$\stackrel{\u02c6}{B}$2 . Measure both angles. Are they equal?
4. Try the following:
Draw
D$\stackrel{\u02c6}{E}$F = 125°.
Bisect
D$\stackrel{\u02c6}{E}$F .
Activity 3
To construct a line perpendicular from a given point to another line
[lo 3.4, 3.5, 4.7]
1. Construct
AD$$BC .
Place your compass point on
A (you want to draw a perpendicular line on
BC from A.)
Make an arc on
BC .
Place the point of your compasses on the one point of intersection between the arc and
BC. Draw a line below
BC. Place the point of your compasses on the other point of intersection between the arc and
BC and draw another line below
BC , so that the two lines intersect.
Connect
A with the intersection of the two drawn lines.
Mark the point of intersection
D .
AD will be perpendicular to
BC . (
AD$$BC .)
Questions & Answers
where we get a research paper on Nano chemistry....?
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest.
Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.?
How this robot is carried to required site of body cell.?
what will be the carrier material and how can be detected that correct delivery of drug is done
Rafiq
Rafiq
if virus is killing to make ARTIFICIAL DNA OF GRAPHENE FOR KILLED THE VIRUS .THIS IS OUR ASSUMPTION
Anam
analytical skills graphene is prepared to kill any type viruses .
Anam
Any one who tell me about Preparation and application of Nanomaterial for drug Delivery
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Is there any normative that regulates the use of silver nanoparticles?