Directional sensor networks have a lot of practical applications. and target coverage is one of the most important issues. In this article. we study the target coverage problem in directional sensor network. https://www.ngetikin.com/super-value-1-2-in-Tobacco-Road-Acacia-Distressed-Engineered-Hardwood-Flooring-4-8-in-Wide-Sample-quick-super/