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