## The Dinosaur Riddle compilation

Riddle a: Find 5 english or german verbs (every direction is possible)

Riddle b: Enter digits (from '1' to '9') so that every digit only appears **once**

in the associated line, column and rectangular block of 9 field elements

Riddle c: Count a preselected digit in the list of numbers from 0 to 99

(use tab control below to select riddle)

## Just counting

How many triangles and how many rectangles do you see on the surface below ?

## Force computations

notes:

You can drag the laptop-display position with mouse inside the Java^{TM} applet below

select laptop 'type 2' to allow an instable situation with dynamic system response

select 'street problem' to compute a mathematical minimum problem

(click here if your browser doesn't support Java)

(this page has been updated on June-09-2008)