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# Math 6 Ch 9 Vocab

### Chapter 9 Vocabulary

acute angle an angle with a measure greater than 0 degrees and less than 90 degrees
acute triangle a triangle having three acute angles
complementary angles two angles are complementary if the sum of their measures is 90 degrees
congruent angles angles with the same measure
congruent figures figures that are the same shape and size
congruent segments line segments that have the same length
corresponding sides the parts of congruent or similar figures that match
degree the most common unit of measure for angles
equilateral triangle a triangle having all three sides congruent and all three angles congruent
isosceles triangle a triangle in which at least two sides are congruent
line segment a straight path between two endpoints
obtuse angle a triangle having one obtuse angle
obtuse triangle a triangle having one obtuse angle
parallelogram a quadrilateral that has both pairs of opposite sides congruent and parallel
quadrilateral a polygon with four sides
rectangle a quadrilateral with opposite sides congruent and parallel and all angles are right angles
rhombus a parallelogram with all sides congruent
right angle an angle that measures 90 degrees
right triangle a triangle having one right angle
scalene triangle a triangle in which no sides are congruent
side a ray that is part of an angle
similar figures figures that have the same shape but different sizes
square a parallelogram with all sides congruent, all angles right angles, and opposite sides parallel
straight angle an angle that measures exactly 180 degrees
supplementary angles two angles are supplementary if the sum of their measures is 180 degrees
tessellation a pattern formed by repeating figures that fit together without gaps or overlaps
trapezoid a quadrilateral with one pair of opposite sides parallel
vertex the common endpoint of the two rays that form an angle
vertical angles nonadjacent angles formed by a pair of lines that intersect
Created by: mquay