The area of a triangle is S =, (1) where "a" is the base length and "h" is the altitude. We are given that a = 2h and the area is 24 square units. Substitute it into (1), and you will get an equation = 24, or = 24. Hence, h = = = = 4.9 units (approximately). Answer. The height is = 4.9 units (approximately).