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Right Triangle
ONE angle = 90°
Acute triangle
All angles < 90°
Obtuse Triangle
one angle > 90°
Scalene triangle
No side lengths are equal
isosceles triangle
2 equal sides
Equilateral triangle
all side lengths are equal
Equiangular triangle
all angles are equal
Isosceles Triangle Theorem
if two sides of a triangle are congruent, then the angles opposite those sides are congruent.
Equilateral Triangles
a triangle is equilateral if and only if it is equiangular
SSS
Side-SIde-Side, 3 congruent sides
SAS
2 Congruent sides and a “Sandwiched” angle
ASA
2 congruent angles and a “sandwiched” side
AAS
2 congruent angles and a “unsandwhiced” side
HL
Only used with right triangles, Hypotenuse and leg (both marked).