29490263-desen-tehnic
TRANSCRIPT
Instruments900
300
600
900
450
450
Lines
Continuous (Thick)
Continuous (Thin)
Dash
Center Line
Tracing of Lines
IncorrectCorrect
×
Tracing of Lines
IncorrectCorrect
×
Tracing of Lines
IncorrectCorrect
×
Tracing of Lines
IncorrectCorrect
×
Tracing of Lines
IncorrectCorrect
×
Bisect angle
300
Bisect angle
Bisect angle
Same distance
Bisect angle
150
150
Regular Polygon
Regular Pentagon
• Give AB = 4cm
4cm
Regular Pentagon
Radius=4cm Radius=4cm
center
Regular Pentagon
Draw a line to connect these two points
Regular Pentagon
Center
Radius
Regular Pentagon
Draw a line to connect these two points
Draw a line to connect these two points
Regular Pentagon
4cm
Regular Pentagon
Regular Hexagon
• Give AB = 4cm, draw a regular Hexagon
4cm
Regular Hexagon
450 450
Regular Hexagon
600 600
Regular Hexagon
4
6
Regular Hexagon
Center
Radius
4
6
Regular Hexagon
4cm
4cm
4cm
4cm
4cm
4cm
Regular Hexagon
Regular Heptagon• Given AB=4cm, draw a regular heptagon
4cm600450
4
6
Regular Heptagon
4
6
8
(4)(6)=(6)(8)
Regular Heptagon
Bisect(6)(8)
4
6
8
Regular Heptagon
4
6
8
7
Regular Heptagon
7
A B
Radius = (7)-(A)
Regular Heptagon
4cm
AB=4cm
4cm
4cm 4cm
4cm
4cm
Regular Heptagon
Given Diameter = 8cm, draw a Regular Octagon
Regular Octagon
Regular Octagon
Radius = 4cm
Regular Octagon
Regular Octagon
0 1 2 3 4 5 6 7 8
(0 to 8) each section must be equal distance
Regular Octagon
0 1 2 3 4 5 6 7 8
Connect these two points
Regular Octagon
0 1 2 3 4 5 6 7 8
Line 1 and Line 2 should be parallel to Line 0
Regular Octagon
Regular OctagonDraw a line to connect these two points
Regular OctagonXx cm
Regular Octagon
Tangent and Circle
R+r
R-r
Tangent and CirclePage 32 : Figure 1
R=20mm
65mm
65mm
R50 + r20 = 70
R50 + r20 = 70
R50 + r20 = 70
R=50mm
R50 + r20 = 70
R50 + r20 = 70
R50 + r20 = 70
Tangent and CirclePage 32 : Figure 2
12mm
R=12mm
40mm
R=12mm
R-r = 23mm
R=47mm
R=35mm
Page 32 : Figure 3
5cm
R=25mmR=12mm
R+R=
65m
m R+R
=52mm
R=4
0mm
R-r=55mmR-r=68mm
R=80m
m
Page 32 : Figure 4
45mm
6mm
R=6mm
R-R=29mm
R=35mm
Draw a line
R=35m
m
R+r = 36mm
R=30mm
Draw a
line
R=30mm
Page 32 : Figure 5
R=22mm
75mm
12mm
R=12mm
10mm
R-r =85-22 = 63mm
R=85mm
R=85mm
R-r =55-12=43mm
R=55mm
Dra
w a
lineD
raw a line
R=55mm
Page 32, Figure 6
Length=112mm
Height=25mm
10mm
Height = around 140mm
900
100mm
R=9mm
H=8mm
R=8mm
R=140mm
R+r =140+9 = 149mm
Draw a line
R=140mm
R=105mm
15mm
R-r=105-15=90mm
Draw a line
R=15mm
R=100m
m
R-r = 100-6=94mm
R+r=105+6=111mm
Draw a
line Draw a line
R=6mm
Page 32. Figure 7
150150
45mm
75mmR60m
m
D50mmD32mm
R40mm + r12.5mm
=52.5mm
R40mm
R40m
mR40m
m
R40mm
