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# Ch. 10 Geometry

### Jerkins 7th gr. Ch. 10 Vocabulary (Glencoe)

WordDescription
Acute Angle An angle with a measure greater than 0 degrees and less than 90 degrees.
Acute Triangle A triangle having three acute angles.
Angle Two rays with a common endpoint from an angle. The rays and vertex are used to name the angle.
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 90 degrees.
Congruent Angles Angles that have the same measure.
Congruent Segments Sides of a polygon that having the same length.
Decagon A polygon having ten sides.
Degrees The most common unit of measure for angles. If a circle were divided into 360 equal-sides parts, each part would have an angle measure of 1 degree.
Equilateral Triangle A triangle having 3 three congruent sides.
Heptagon A polygon having seven sides
Hexagon A polygon having six 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 haves that are reflections of each other.
Line Symmetry Figures that match exactly when folded in half have line symmetry.
Nonagon A polygon having nine sides.
Obtuse Angle Any angle that measures greater than 90 degrees but less than 180 degrees.
Obtuse Triangle A triangle having one obtuse angle
Octagon A polygon having eight sides.
Parallelogram A quadrilateral with opposite side parallel and opposite side congruent.
Pentagon A polygon having five sides.
Polygon A simple closed figure in a plane formed by three or more line segments.
Quadrilateral A closed figure having four sides and four angles.
Reflection A type of transformation where a figure is flipped over a line of symmetry.
Regular Polygon A polygon that has all sides and all angles congruent.
Rhombus A parallelogram having four congruent sides.
Right Angle An angle which measures exactly 90 degrees.
Right Triangle A triangle having one right angle.
Scalene Triangle A triangle having no congruent sides.
Similar Figures Figures that have the same shape and congruent angels but not necessarily the same size.
Straight Angles An angle that measures exactly 180 degrees.
Supplementary Angles Two angles are supplementary if the sum of their measures is 180 degrees.
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 with 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: jerkins