Answer:
see image
Explanation:
Angle 3
Angle F
Angle HFG
Angle GFH
(I can't type an angle symbol, so i put it on the image.)
It is an acute angle.
An acute angle is smaller than 90°.
A right angle is square, it is exactly 90°.
An obtuse angle is larger than 90°.
A straight angle is 180° and looks like a straight line.