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let you have a triangle with ABC sides
put your campus at one of the side and open its width to the shortest side
then draw a arc cutting the adjacent big side
then put the campus on the adjacent side of the first point where you had put the campus
draw width of the campus to the adjacent short side and then draw acr on the bigger side of triangle like you had done in first step
then put the campus on the point where arc has cut the side of triangle and open the campus to the one of adjacent side then draw arc do this process for the other side as well where arc has cut the triangle
the where the both of last arc met draw a line to that point to the side of triangle for which you had draw arcs
do all this process for other two line
three lines should met at one point
this is how you can draw altitude of a triangle
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