These reflected rectangles are example of congruent shapes. When transforming a shape, either through translation, reflection or rotation, a congruent shape is produced. Enlargements create shapes ...

Polygons can be regular or irregular. If the angles are all equal and all the sides are equal length it is a regular polygon. To find the sum of interior angles in a polygon divide the polygon into ...

THE little book by Messrs. Workman and Cracknell is preparatory to a forthcoming work on “Geometry, Theoretical and Practical,” on which the authors are now busily engaged. It consists essentially of ...