Question

name two lines in the diagram.
diagram with labels: b, plane s, a, $overleftrightarrow{bc}$, $overleftrightarrow{de}$, plane t, e, d (with checkboxes for each)

Explanation:

Step1: Recall the notation for a line

A line is denoted by a line with two arrows on both ends, using two points on the line. So we look for options with this notation.

Step2: Identify the line notations

Among the options, $\overleftrightarrow{BC}$ and $\overleftrightarrow{DE}$ are in the line notation (with two arrows), representing lines. The other options are either points (B, A, E, D) or planes (Plane S, Plane T), not lines.

Answer:

$\overleftrightarrow{BC}$, $\overleftrightarrow{DE}$