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River Rat
Thanks Arpenteur


Measure any distance along the river bank
We will pretend it is 40 metres.
A to C = 40 metres

Measure any distance perpendicularly from C to D.
We will pretend it is 12 metres.
C to D = 12 metres

From point D imagine a straight line to B.
Notice the intersection point E.
Measure the distance from E to A
A to E = 24 metres.
E to C is 16 metres.

Now apply this math formula-   AB:DC = AE:EC

Therefore the width of the river is 18 metres.
AB = 18 metres

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