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:
AC = 75°
Type of angle:
2.2
CE = 135°
Type of angle:
2.3
FH = 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
ABC with
BC = 40 mm,
= 70° and
= 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
PQR with
QR = 58 mm,
PR = 62° and
QR = 69°.
Measure:
PQ = mm
=
4.2 Isosceles
ABC with
BC = 42 mm,
AB =
AC and
= 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
(angle
B ) with the point where your pencil lines intersect.
1 will have the same size as
2 . Measure both angles. Are they equal?
4. Try the following:
Draw
DF = 125°.
Bisect
DF .
Activity 3
To construct a line perpendicular from a given point to another line
[lo 3.4, 3.5, 4.7]
1. Construct
ADBC .
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.
the study of living organisms and their interactions with one another and their environment.
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discuss the biological phenomenon and provide pieces of evidence to show that it was responsible for the formation of eukaryotic organelles in an essay form
advantage of electronic microscope is easily and clearly while disadvantage is dangerous because its electronic. advantage of light microscope is savely and naturally by sun while disadvantage is not easily,means its not sharp and not clear
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is like gone fail us
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cells is the basic structure and functions of all living things
A scanning electron microscope (SEM) is ideal for situations requiring high-resolution imaging of surfaces. It is commonly used in materials science, biology, and geology to examine the topography and composition of samples at a nanoscale level. SEM is particularly useful for studying fine details,
