equilateral triangle - Has three sides that are equal, isosceles triangle - A triangle that has two equal sides, scalene triangle - A triangle that has no equal sides., acute angle - An angle that is less than 90 degrees., obtuse - An angle that is more than 90 degrees, right angle - An angle that is 90 degrees., parallel lines - Two lines that go on and on and do not touch, perpendicular lines - Two lines that cross at a 90 degrees angle, line - A line that goes on indefinitely in both directions, ray - A line that goes on in one direction., line segment - A part of line., right triangle - A triangle that has one 90 degree angle, acute triangle - A triangle that has three angles less than 90 degrees, obtuse triangle - A triangle that has one angle larger than 90 degrees.,

Geometry grade 4

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