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Angle Relationships

Pre-Algebra

TermDefinition
Vertical Angles Angles that are across from each other. They are congruent or "equal" or "the same measure"
Adjacent Angles Two angles that share a common vertex and side. They are next to each other.
Complementary Angles Sum to 90 degrees
Supplementary Angles Sum to 180 degrees
Parallel Lines Two lines that never intersect.
Transversals A line that intersect two or more lines.
Corresponding Angles are in the same position on the parallel lines in relation to the transversal. These angles are always congruent or the "same measure"
Alternate interior Angles are inside the parallel lines and on opposite sides of the transversal. These angles are always congruent or the "same measure".
Alternate Exterior Angles are outside the parallel lines and on opposite sides of the transversal. These angles are always congruent or the "same measure".
Consecutive Interior Angles are on the same side of the transversal and inside the parallel lines. these angles are always supplementary or sum to 180 degrees.
Triangle Sum Theorem This theorem states that the sum of the measure of the three interior angles of a triangle is always 180 degrees.
Exterior Angle Theorem This theorem states that the sum of the two remote interior angles of a triangle will always be equal to the exterior angle of the triangle.
Acute Triangle All angles of a triangle are less than 90 degrees
Obtuse Triangle One angle of a triangle is more than 90 degrees
Right Triangle One angle of a triangle is equal to 90 degrees
Scalene Triangle No Congruent Sides or no equal sides of a triangle.
Isosceles Triangle Two congruent sides and two congruent angles of a triangle. Congruent means "equal to".
Equilateral / Equiangular Triangle All Sides and all angles are congruent. The angles all equal 60 degrees.
Created by: hcarew
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