Angles of Triangles
Angles of Triangles
Section 5.1
Classifying Triangles by Sides
? Scalene triangle ? no side congruent. ? Isosceles triangle ? two sides congruent.
? Equilateral triangle ? all sides congruent.
Classifying Triangles by Angles
? Acute triangle ? 3 acute angles. ? Obtuse triangle ? 1 obtuse angle.
? Equiangular triangle ? 3 congruent angles.
? Right triangle ? 1 right angle.
Classifying Triangles in a Plane
Angles of a Triangle
? When sides of a triangle are extended, other angles are formed.
? Interior Angles: The original angles of the triangle. ? Exterior Angles: The angles that form linear pairs with
the interior angles
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