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

perpendicular
two lines that intersect to form a right angle

equilateral
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 having the same measurement

scalenea
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

