Question

1. what symbol is used in a diagram to say that lines are parallel? the same number of tick marks on each line. the same number of arrow heads on each line the same number of arcs (curves) on each line.

Explanation:

In geometry diagrams, the symbol used to denote parallel lines is the same number of arrow heads on each line. Tick marks are used for congruent segments, and arcs (curves) are used for congruent angles.

Answer:

The same number of arrow heads on each line.