| A | B |
|---|
| Circle | A circle is the collection of points in a plane that are all the same distance from a fixed point. The fixed point is called the center. A line segment joining the center to any point on the circle is called a radius. |
| Congruent | Geometric figures having the same size and shape; all corresponding parts of congruent figures have the same measure. |
| Histogram | An accurate and comprehensive graph for evaluating image tonal values. Displays shadows in the left part of the graph, midtones are shown in the middle and highlight values are shown at the right part. This is useful for gauging precise corrections from the Image > Adjustments commands. |
| JPEG | A commonly used method of compression, reducing the image data in order to be able to store or transmit in an efficient form, for photographic images. The degree of compression can be adjusted, allowing a selectable tradeoff between storage size and image quality |
| Parallelogram | A four-sided polygon with two pairs of parallel sides. The sum of the angles of a parallelogram is 360 degrees. |
| Polygon | A polygon is a closed figure made by joining line segments, where each line segment intersects exactly two others. |
| Rectangle | A four-sided polygon having all right angles. The sum of the angles of a rectangle is 360 degree. |
| Reflection (flip) | A transformation, which produces the mirror image of a figure (i.e., flipping a figure across a line). |
| Rhombus | A four-sided polygon having all four sides of equal length. The sum of the angles of a rhombus is 360 degrees. |
| Rotation (turn) | A transformation obtained by rotating a figure around a fixed point (i.e., turning a figure about a point). |
| Similar | Two or more figures having the same shape but not necessarily the same size. |
| Square | A four-sided polygon having equal-length sides meeting at right angles. The sum of the angles of a square is 360 degrees. |
| Symmetry | A figure has symmetry if there exists some line or point through which all points of the figure can be reflected to generate another point on the figure. |
| Transform | Transforming changes an object’s appearance by modifying one or more of its physical characteristics. The Transform functions in ADOBE Photoshop CS3 are scaling, rotating, skewing, changing perspective, distorting, and flipping. |
| Trapezoid | A four-sided polygon having exactly one pair of parallel sides. The two sides that are parallel are called the bases of the trapezoid. The sum of the angles of a trapezoid is 360 degrees. |
| Triangle | A three-sided polygon. The sum of the angles of a triangle is 180 degrees. |
| Vector Graphics | The use of geometrical primitives or geometric objects the system can handle (Draw, Store) such as points, lines, curves and shapes or polygons, which is the representation of images as an array of pixels (small dots), as it is typically used for the representation of photographic images. |
