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Topic 12 Vocabulary
Term | Definition |
---|---|
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. |