The best of the web No Monday without maandagpuzzel. Substance you rekenknobbel and stairs the week started with this riddle: can you say how large the green corner is?
On the following figure you can see a construction of two triangles and a straight line. The three blue angles are equal. The red corner is exactly 90 degrees. The purple angle is 100 degrees.
Read also Los you our maandagpuzzel? Anyone can still up to 17 count, or not? Question
you Can calculate how big the green corner is?
