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acute angles
angles that have a measure of less than 90 degrees

perpendicular
two lines that form a right angle

equilateral
a triangle with 3 equal sides

obtuse
angles that have a measure between 90 and 180 degrees

adjacent
two angles that share a common side

isosceles
a triangle with 2 equal sides

right
angles having a measure of 90 degrees

congruent
angles have the same angle measurement

scalene
a triangle with no equal sides

parallel
two lines that never intersect

triangle sum property
the sum of the angles in a triangle is 180 degrees

