SCOUTING FOR GIRLS 
Diagram A. To Measure Width of Stream or Road 
ject X on the far side of the stream can be seen in direct 
line with the stake C. At this point place stake E. 
Measure the distance from E to D. With paper and 
pencil mark down the example — for such it is — in this 
way: 
DC : CB : : DE : BX 
or 
as the length from D to C is to the length of C to B 
so 
is the length from D to E to the length from B to X 
or as in this example, 
as 10 is to 20 so 8 is to the distance from B to X, which 
would be 16. Having discovered the distance between A 
and B in the case given, 4 feet from the distance between 
B and X and the result will give the width of the stream, 
which is 12 feet. 
It may not be always necessary to use the line A — B 
but if the edge of the stream or road is crooked it is 
necessary in order to make B — D a straight line at right 
angles to A — X. 
In calculating a height, as that of a tree, house or 
tower, the triangles can again be used, as shown in 
diagram b. Choose a level strip of ground; pace the 
distance in a straight line, from the base of the tree A, ot 
