When should you skip over the use of dialogue

Ineed with another opening line. here's the idea: a girl got detention for something she didn't do, and had to stay afterschool until evening. she headed towards the bathroom, only to be lured away by distant music. she walks down the dark hallway (which lead to the auditorium) and saw a boy playing the piano, perfectly. i just need a detailed description of this. best will be awarded brainliest. you

7. a line of symmetry divides a design so that every point on one side of the line coincides a point on the other side of it determine how many lines of symmetry each figure below has then draw all the lines of symmetry. show your work

1. the group spurned the newcomer and accepted him gladly.