obtuse angle
An angle whose measure is greater than 90°
and less than 180°
Example:
obtuse triangle
A triangle that has one obtuse angle
Example:
octagon
A polygon with eight sides
Examples:
parallel lines
Lines in a plane that never intersect
Example:
parallelogram
A quadrilateral whose opposite sides are
parallel and congruent
Examples:
pentagon
A polygon with five sides
Examples:
