Nimetön työkirja

Theorem 2.4.1. In a triangle, the sum of the measures of the interior angles is 180

We are now shoving that the sum of the measures of the interior angles of all triangles is 180[math]^\circ[/math]. First we will show some examples of this statement and in the end we provide a formal proof for this theorem.

1. Example triangle ABC

2. Example triangle DEF

Proof of the theorem

Now we will make a formal proof so that we can see these two example triangles are not only exceptions but that the theorem 2.4.1. is always valid.

Nimetön työkirja

Theorem 2.4.1. In a triangle, the sum of the measures of the interior angles is 180

1. Example triangle ABC

2. Example triangle DEF

Proof of the theorem

信息: Nimetön työkirja