What angle – sharp, obtuse or unfolded, do the hands of the clock form when they show 1h; 3h; 6h; 13h; 9h; 21h?

Explanation: An acute angle is an angle less than 90 degrees. An obtuse angle is an angle greater than 90 degrees, and an unfolded angle is an angle whose degree is 180 degrees.

When the arrows show:

1.1 hour An acute angle is formed;

2. 3 hours. A right angle is formed;

3.6 hours. Expanded corner;

4.13 hours. Sharp corner;

5.9 hours. Right angle;

6.21 p.m. Right angle.