Obtuse Triangle

Obtuse Triangle- One side is above 90 degreese.

Scalene Obtuse

Scalene obtuse- all angles are different and one angle is above 90 degreese.

Scalene acute

Scalene acute- all angles are different and 1 angle is above 90 degreese.

Isosceles obtuse

Two sides are congruent and one side is greater then 90 degrees.

Isosceles Acute

Two sides are congruent and one side is less then 90 degrees.

Acute Triangle

All three angles are different and all angles are less than 90.

Isosceles Right Triangle

An isosceles right triangle has angles of 45 degrees, 45 degrees, and 90 degrees.

Isosceles triangle

A triangle with  two equal sides, and one side is greater than 90.

AAS

  
* Anlges BC and ED are congruent
* Angles AB and FE are congruent
* Angles AC and FD are congruent

SSS

* Angles AB and YX are congruent
* Angles BC  and YZ are congruent
* Angles CA and ZX are congruent

SAS

.

• Angles D and C are congruent 
• Sides DE and  BC are congruent
• Angles E and  B are congruent

ASA

These triangles are angle side angle.

Constructing a perpendicular at a point on a line

Side Angle Side

Equilangular Triangle

 All angles and all sides are equal

Different triangles

Isosceles obtuse -Has a right angle 90 and  two equal angles
Isoscels acute -  Has a right angle less than 90
Scalene obtuse - One side is greater than 90

Scalene acute- All sides are less than 90
Scalene right - A triangle that has a right angle

Triangle classification

Angles and Sides



            Sides

• 
  
  Scalene
• 
  
  Equilateral
• 
  
  Isosceles

Angles

• Right
• Obtuse
• Acute
• Equilangular

Side Angle Side

Triangles ABCFED

Side Angle Side (SAS)

This two triangles are congruent by side angle side. Angles ABC are congruent to angles A' B' and C'.