Classification of Triangles

Equilateral Triangle-An equilateral triangle is a triangle with all three sides  of equal length.

Equilangler triangle- All angles are the same.




Equilateral Triangle

 



Isosceles Triangle-An isosceles triangle is a triangle with at least two equal sides.



Isosceles Right triangle- one angle is 90 degrees and the other two angles are 45 and 45 degrees.

 




 

Isosceles Acute triangle- all angles are less than 90 degrees.

Isosceles Obtuse triangle - one angle is more than 90 degrees and two angles are less than 90 degrees.

Scalene Triangle-A triangle with all sides of different lengths.
No sides are equal and no angles are equal.


Scalene right triangle- one angle is 90 degrees and the other two are less than 90 degrees.

 



Scalene Acute triangle- All angles are less than 90 degrees.

Scalene Obtuse triangle- one angle is more than 90 degrees and the others are less than 90 degrees.

ASA,AAS,SSS,SAS

This is ASA because of the following:

• 
  
  Angles FDE and ACB are congruent angles.
• 
  
  Lines ED and BC are congruent sides
• 
  
  Angles ABC and FED are congruent angles

This is AAS because of the following:

• 
  
  Angles ACB and FDE are congruent angles.
• 
  
  Angles ABC and FED are congruent angles also.
• 
  
  Lines AB and FE are congruent sides.  

This is SSS because of the following:

• 
  
  Lines AB and FE are congruent sides.
• 
  
  Lines BC and ED are congruent sides.
• 
  
  Lines CA and DF are congruent sides also.

This is SAS because of the following:

• 
  
  Lines AB and FE are congruent sides.
• 
  
  Angles ABC and FED are congruent angles.
• 
  
  Lines BC and ED are congruent sides.

Orthocenter video

This video is about the orthocenter is the point where the three altitudes of a triangle intersect one of a triangle's points of concurrency.