Geometric terms can somtimes fluster a K6 student. Some can sound so familiar from use, and some they can barely pronounce! Use this
easy to follow geometry dictionary and have all the geometry terms they need explained.
|
|
 | Oblique: | Lines at an angle to the x-axis. |
 | Oblique Prism: | A prisim with bases not aligned directly above one another. |
 | Obtuse angle: | Any angle greater than 90 degrees and less than 180 degrees. |
 | Obtuse Triangle: | A triangle with one obtuse angles. |
| Octa: | Prefix for 8 |
 | Octagon: | An eight sided polygon. |
 | Octahedron: | A polyhedron with 8 faces. |
| Order of rotation: | How many times an outline matches its original during one full rotation. |
 | Ordered Pair: | Where information is given through a pair of numbers and the order is critical. Ordered pairs are used in coordinate geometry to indicate a points position. (1,3) is not the same as (3,1) |
 | Origin: | The point of intersection of the X-axis and Y-axis on the cartesian plane. |
 | Parallel lines: | Lines that will never intersect. |
 | Parallelogram: | A quadrilateral with oposite sides equal in legth and parallel. |
 | Pattern: | A repitition of objects. |
| Penta: | Prefix for 5 |
 | Pentagon: | A 5 sided polygon. |
| Pentahedron: | A Polyhedron with 5 faces. |
 | Perimiter: | The outline of a two dimensional shape. |
 | Perpendicular: | Two lines that meet at 90 degrees are said to be perpendicular. |
 | Perpendicular Bisector: | A line that meets a line segment at 90 degrees AND bisects it. |
 | Pi: | The ratio of a circles circumpherence to its diameter. |
 | Plane Shape: | A flat shape with only two dimensions. |
 | Platonic Solid: | Five Regular Polyhedra made only with either equilateral triangles, squares or pentagons. |
| Poly: | Prefix for MANY |
 | Polygon: | A plane shape with three or more straight sides. |
 | Polyhedron: | Three dimensional objects made with plane shapes. |
| Position: | Where something is when compared to an object or its surroundings. |
 | Prism: | Right Prism: A three dimensional shape made of two identical plane shapes, and all other faces are rectangles; Oblique Prism: Made of two identical plane shapes, and all other faces are parallelograms. |
 | Protractor: | An instrument used in geometric construction to measure degrees of angles. |
 | Pyramid: | A three dimensional shape with a polygon as its base and all other faces congruent triangles that meet at the top (its vertex) |
 | Pythagoras: | A Greek mathematician who lived circa 500BC. Famous for his theorem on Right Angled Triangles. |
 | Pythagorean Theorem: | In a right angled triangle, the square of the hypotenuse is equal to the sum of the squares of the other two sides. |
