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# Topic 12 Vocabulary

TermDefinition
Equilateral Triangle A triangle with all congruent sides and each angle measuring 60 degrees.
Scalene Triangle A triangle with no sides congruent.
Isosceles Triangle A triangle with two sides congruent.
Obtuse Triangle A triangle with one obtuse angle.
Acute Triangle A triangle with all angles acute.
Right Triangle A triangle with one angle measuring 90 degrees.
Congruent Equal to
Quadrilateral A closed figure with 4 sides.
Trapezoid A quadrilateral with only one pair of parallel sides.
Parallelogram A quadrilateral with opposite sides parallel and congruent.
Rhombus A parallelogram with 4 congruent sides.
Rectangle A parallelogram with four right angles.
Square A parallelogram with four right angles and all sides congruent.
Pyramid A 3-Dimensional figure with a base that is a polygon and triangular faces that meet at a vertex.
Three-Dimensional Figure A figure that does not lie in one plane.
Triangle A polygon with three sides.
Pentagon A polygon with 5 sides.
Hexagon A polygon with 6 sides.
Octagon A polygon with 8 sides.
Heptagon A polygon with 7 sides.
Nonagon A polygon with 9 sides.
Decagon A polygon with 10 sides.
Dodecagon A polygon with 12 sides.
Plane A flat surface that extends indefinitely in all directions,
Cross Section A intersection of a three-dimensional figure and a plane.
Created by: lindsey.doudna