Q.
I will make a straight line, and one end of it shall lean on another straight line, but instead of being upright like the perpendicular line, you see that it is sloping.

What does it form?
A.One side of it is an acute angle, and the other side is an obtuse angle.

Q.Which side is the obtuse angle?
A.That which is the most open.

Q.And which is the acute angle?
A.That which is the least open.

Q.What does acute mean?
A.When the angle is sharp.