A seven-sided figure is geometrical shape with seven straight sides and corners. There are several synonyms for a seven-sided figure, including heptagon, septagon, and septangle. The term heptagon is the most commonly used synonym for seven-sided figure, and it is commonly used in geometry and trigonometry. Septangle is also sometimes used, although it is less common. Regardless of which term is used, a seven-sided figure is an interesting and unique shape, and it has its own set of properties and characteristics that differentiate it from other geometrical shapes. Overall, knowing the different synonyms for a seven-sided figure can make it easier to communicate about it more effectively in various contexts.