All terms in this list:

Acute triangle: A triangle all of the angles of which are acute.

obtuse triangle: A triangle one of the angles of which is obtuse.

acute angle: An angle measuring less than ninety degrees.

perpendicular: At or forming a right angle (to).

equilateral triangle: A triangle having all three sides equal.

isosceles triangle: A triangle having two sides equal.

scalene triangle: A triangle having each of its three sides of different lengths.

right triangle: A triangle having a right angle as one of its interior angles.

equiangular triangle: 3 congruent angles

triangle: A polygon with three sides and three angles.

line segment: A part of a straight line bounded by two points.