1. Constructing parallel lines
with scale and compass

2. drawing an arc
center
radius 2

3. drawing an arc spiky end of compass pencil end of compass
You have to draw with the compass
spread this much apart

4. with alternate angle
draw angle = previous angle
make an angle

5. with corresponding angle
draw angle = previous angle
make an angle

6. with parallelogram one vertex of parallelogram two equal sides
another vertex
remaining two equal opposite sides

7. dividing a line segment equally
in 3 pieces
with a triangle
3rd side
3 equal corresponding angles
divide 2nd line in 3 parts
3 – 1 = 2 lines parallel to 3rd side

8. dividing a line segment equally
in 3 pieces
with a pair of parallel lines
1st line
equal alternate angles
cut 3 – 1 = 2 parts from each line
i.e. 2 x 2 = 4 equal segments
2nd line

9. dividing a line segment equally
To divide the line segment in 3 pieces
2 parts were cut from each parallel line
How many parts should be cut from each parallel line to divide a given line segment in 7 pieces?