Answer: The primary rectangle contains a length of 2a units (since it is labeled as "2a" within the diagram), so its zone is 2a x a = 2a^2 square units.
The moment rectangle contains a length of 3a units (since it is labeled as "3a" within the diagram), so its range is 3a x a = 3a^2 square units.
The third rectangle contains a length of 4a units (since it is labeled as "4a" within the graph), so its range is 4a x a = 4a^2 square units.
To discover the overall region of the expansive rectangle, able to include the zones of these three rectangles:
Add up to zone = 2a^2 + 3a^2 + 4a^2
Disentangling this expression, we are able combine the like terms (2a^2, 3a^2, and 4a^2) to urge:
Add up to range = (2 + 3 + 4) a^2
Explanation: