1. Two sides of an angle are another angle, and the angles of extension lines on both sides are diagonal.

2. There is one and only one straight line perpendicular to the known straight line.

Plane geometry is correct, solid geometry is incorrect.

The complementary angle of acute angle must be greater than this angle.

4. The length from a point outside a straight line to the vertical section of the straight line is called the distance from the point to the straight line.

correct