Hey can anyone please tell me how is this angle 60 i found a video and it answers without answering.

\Delta ABC is equilateral. Using the fact that BC || l and properties of parallel lines, it follows that x must be equal to an angle in that triangle.

Hey thank u for the reply can u tell me if i can apply congurgency poperty sas?

No. There is only one triangle to begin with. What you can consider is applying *similar* triangle properties (after constructing an appropriate triangle).

please bare with me…the way i visaulised it is that i line L is paralell and so is other one so i took pencils and made a traingle than on line bc i howvered a penicl parallel to and on top of it and on top of ac as well and than at only 60 degree were they parallel to it otherwise they would change…

like congrugency and similarity are two different things in similalrity its ratio of sides isnt it?

The ratio of sides would be the same, and so would be the angles.

sorry to bother u again and again can u give me and exmple via a picture please or a link to a smilar question please or a link to the relvant topic

Have you seen the congruency and similarity of triangles videos on PrepSwift?

no i havent yet i have to update to prepswift wait let me bounce there