Constructing triangles
You will need: a protractor, compasses, a ruler and pencil.
1. One side and 2 angles
m
.4c
12
= AC
1
2. 2 sides and an angle
m
.4c
12
C =
A
2
3. 3 sides
Angle CAB= 116.50
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3
7
10
1
4
3
8
1
2
3
4
40
1
10
3
5
1
5
9
20
4
Constructing an equilateral triangle
Draw a base line.
Set your compasses to 10cm.
Mark A on the left of your base line and B 10cm away.
A
B
From A draw an arc and from B draw an arc.
A
B
C is your 3rd point of the triangle!
Make an equilateral triangle with sides 8cm.
Construct a rhombus
Make the net of a tetrahedron by constructing equilateral triangles
(include tabs if you want to stick it together)
5
Constructing the perpendicular bisector of a line.
A
B
6
Bisecting an angle
7
Accurately draw this parallelogram
10cm
620
15cm
8
Attachments
C. Plans and elevations.ppt