To work out the equation for any line, you need the equation mx+c.
M, is the gradient, this is the difference between each of the points. The point on the x axis divided by the point on the y axis.
C, is the y intercept, this is where the line intercepts the y axis. This can be a positive number or a negative number. Sometimes you may have to extend the line if it does not touch the y axis, for this use the gradient.
Constructing Triangles
To construct a triangle without the sizes of the angles you need to:
1) Draw your base line however long it needs to be.
2) Open your compass to the size of the side connected to the left edge of your straight base line.
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