Battle of the Iron Triangle ending a bitter four-month struggle. Following the withdrawal from Base 82 COSVN organized a new corps headquarters in the Tay Ninh- Binh Long region and designated it the 301st Corps. This corps would soon direct the combat operations of the 7th and 9th NVA Divisions, separate regiments, and additional formations already en route from North Vietnam. Meanwhile General Thuần decided to rest the tired troops of the 5th Division and turned his attention to sending his 25th Division to clear out the PAVN bases in the Ho Bo area west of the Iron Triangle. The ARVN defenses around An Dien
Extouch triangle the sides of the reference triangle at the three vertices of the extouch triangle. The area of the extouch triangle, formula_7, is given by: where formula_9, formula_10, formula_11 are the area, radius of the incircle and semiperimeter of the original triangle, and formula_12, formula_13, formula_14 are the side lengths of the original triangle. This is the same area as that of the intouch triangle. Extouch triangle In geometry, the extouch triangle of a triangle is formed by joining the points at which the three excircles touch the triangle. The vertices of the extouch triangle are given in trilinear coordinates by: