demonstration about equilateral triangle

[the_taxi_tank]

so i need to demonstrate that an equilateral triangle has got equal angles (all angles r de same) pls halp me internet is so empty about geometrical demonstrations. hav a nice day OwO

[Ghideon]

Hello, I might be able to hint you in the right direction; 
-What have you tried so far?
-Are you familiar with some other basic triangle theorems that you may start from?

 

[studiot]

1 hour ago, the_taxi_tank said:

so i need to demonstrate that an equilateral triangle has got equal angles (all angles r de same) pls halp me internet is so empty about geometrical demonstrations. hav a nice day OwO

To do this you need to know about isoceles triangles and their angles.

 

Do you know this?

[Country Boy]

Draw a line from one of the vertices to the midpoint of the opposite side.  What can you say about the two triangles created?

[studiot]

55 minutes ago, Country Boy said:

Draw a line from one of the vertices to the midpoint of the opposite side.  What can you say about the two triangles created?

 

A very good approach, probably the best one if your development of geometry has reached congruent triangles by this stage, but I fear that the OP has long gone.

+1

Edited October 11, 2018 by studiot