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# C2_Chapter 10

### Chapter 10 Vocabulary

Angle Two rays with a common endpoint form an angle. The rays and vertex are used to name the angle.
Acute Angle An angle with a measure greater than 0° and less than 90°.
Acute Triangle A triangle having three acute angles.
Adjacent Angles Angles that have the same vertex, share a common side, and do not overlap.
Circle Graph A type of statistical graph used to compare parts of a whole.
Complementary Angles Two angles are complementary if the sum of their measures is 90o
Congruent Angles Angles that have the same measure.
Congruent Figures Figures with equal corresponding sides of equal length and corresponding angles of equal measure.
Congruent Segments Segments having the same measure.
Corresponding Sides Congruent or proportional sides of similar figures.
Decagon A polygon having ten sides.
Degree Degree
Equilateral Triangle A triangle having three congruent sides.
Hexagon A polygon having six sides.
Heptagon A polygon having seven sides.
Indirect Measurement Finding a measurement by using similar triangles and writing a proportion.
Isosceles Triangle A triangle having at least two congruent sides.
Line of Symmetry A line that divides a figure into two halves that are reflections of each other.
Line of Reflection The line over which a figure is reflected.
Line Symmetry Figures that match exactly when folded in half have line symmetry.
Nonagon A polygon having nine sides.
Octagon A polygon having eight sides.
Obtuse Angle Any angle that measures greater than 90° but less than 180°.
Obtuse Triangle A triangle having one obtuse angle.
Parallelogram A quadrilateral with opposite sides parallel and opposite sides congruent.
Pentagon A polygon having five sides.
Quadrilateral A closed figure having four sides and four angles.
Right Angle An angle that measures 90°.
Right Triangle A triangle having one right angle.
Regular Polygon A polygon that has all sides congruent and all angles congruent.
Reflection A type of transformation in which a figure is flipped over a line of symmetry.
Rhombus A parallelogram having four congruent sides.
Scalene Triangle A triangle having no congruent sides.
Similar Figures Figures that have the same shape but not necessarily the same size.
Straight Angle An angle that measures exactly 180°.
Supplementary Angles Two angles are supplementary if the sum of their measures is 180°.
Tessellation A repetitive pattern of polygons that fit together with no holes or gaps.
Transformation A movement of a geometric figure.
Translation One type of transformation where a geometric figure is slid horizontally, vertically, or both.
Trapezoid A quadrilateral with one pair of parallel sides.
Triangle A polygon that has three sides and three angles
Vertex A vertex of an angle is the common endpoint of the rays forming the angle.
Vertical Angles Opposite angles formed by the intersection of two lines.
Created by: Mrs_Irish