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12 terms

Classifying Triangles and Angle Measures in Triangles

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Acute Triangle
a triangle with three acute angles
Obtuse Triangle
a triangle with one obtuse angle
Right Triangle
a triangle with one right angle
Equiangular Triangle
a triangle with three acute angles that are all 60 degrees
Scalene Triangle
a triangle with no congruent sides
Isosceles Triangle
A triangle with at least two congruent sides
Equilateral Triangle
a triangle with three congruent sides
Legs
the two congruent sides of an isosceles triangle or the two sides that form a right angle
Hypotenuse
the side of a right triangle opposite the right angle
Base
the non-congruent side of an isosceles triangle
Base Angles
the two angles opposite the legs; they are congruent
Vertex Angle
the angle opposite the base in an isosceles triangle