Scalene triangle |
Three different side lengths Three different angle measures |
Isosceles triangle |
At least two congruent sides At least two congruent angles |
Equilateral triangle |
Three congruent sides Three congruent angles The angle measure equals 60 degrees |
Acute triangle |
Triangle with three angles that measure less than 90 degrees |
Obtuse triangle |
Triangle with one angle greater than 90 degrees |
Right triangle |
Triangle with one right angle ( 90 degrees) The other two angles are complementary |