Videos Test Yourself Books MathFacts Math Diagnostics Math Tricks Daily PhysEd
Class Photos Worksheets Math Genius Musiclopedia More Resources Teacher Timesavers Study Guides
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

Math Puzzles