3.4: Parallel Lines and the Triangle Angle-Sum Theorem Flashcards
Isosceles Triangle
at least two sides are congruent.
Right Triangle
one right angle
Exterior Angle of a Polygon
an angle formed by a side and an extension of an adjacent side.
Equilateral Triangle
all sides are congruent.
Scalene Triangle
no sides are congruent.
Remote Interior Angles
the two nonadjacent interior angles to an exterior angle.
Acute Triangle
all angles are acute.
Obtuse Triangle
one obtuse angle
Equiangular Triangle
all angles are congruent.
Polygon
a closed plane figure with at least three sides that are segments.
Concave Polygon
has at least one diagonal with points outside the polygon.
Convex Polygon
has no diagonal with points outside the polygon.
Regular Polygon
both equilateral and equiangular.
Equilateral Polygon
has all sides congruent.
Equiangular Polygon
has all angles congruent.
