Five squares in a configuration. What’s the angle α?
Scroll down for a solution to this problem.
Solution
The angle α is 45°.
Acknowledging the 135° angle at E, one gets the quarter circle centred in D. It is easy to see ΔAED is an equilateral triangle, as is ΔDGF. Thus we see that DNEC is a cyclic quadrilateral. Now using the Inscribed Angle Theorem one gets that α=∠NGE/2=45°.