acute triangle - A triangle that has three acute angles. , isosceles triangle - A triangle with at least two equal sides., equilateral triangle - A triangle with three sides that are the same length., obtuse triangle - A triangle that has one obtuse angle. , right triangle - A triangle that has one right angle. , scalene triangle - A triangle with no sides that are the same length. , intersecting lines - Lines that pass through the same point. , parallel lines - Lines that never intersect., perpendicular lines - Intersecting lines that form right angles. , right angle - An angle that forms a square corner. , acute angle - An angle that is open less than a right angle. , obtuse angle - An angle that is open more than a right angle but less than a straight angle. ,

Topic 15 Lines, Rays, and Angles

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