Rectangle Diagram with Dimensions

A simple yet effective diagram showcasing a larger rectangle divided into two distinct sections: a blue square-like area on the left and a red rectangular area on the right. The height of both sections, and thus the overall rectangle, is clearly marked as 'a'. The widths are also labeled, with the blue section having a width of 'a' and the red section a width of 'b'. An encompassing green bracket at the bottom indicates the total width as 'a + b'. This visual serves as an excellent educational tool for understanding basic geometric dimensions, area composition, or even the distributive property in algebra.

rectangle - geometry - dimensions - math - diagram - area - algebra - visual aid - education