Write up on GEOMETRY OF STRAIGHT LINES. Refer to the diagram below:

Here are the solutions to your geometry questions:

2.1: The four different angles formed by the diagram, using the given labels, are:

• $\boldsymbol{a}$
• $\boldsymbol{b}$
• $\boldsymbol{c}$
• $\boldsymbol{d}$

2.2: The name of line EF is a transversal.
Line EF intersects two or more other lines (AB and CD).

2.3: The name of lines AB and CD is parallel lines.
The arrows on the lines indicate that they are parallel to each other.