三角形面积的计算是初中平面几何中的重要内容,在日常生活和科学技术中有着广泛的应用,现把它归类总结．掌握下列公式,对提高解题能力和应用能力都有一定帮助．一、公式公式1：S_△=1/2ah．其中a是底边长,h是高．它是计算三角形面积的基本公式．公式2：S_△=(p(p-a)(p-b)(p-c))~(1/2)．其中a,b,c分别是三角形三边长,且p= The calculation of the triangle area is an important content in the plane geometry of junior middle school. It has a wide range of applications in daily life and science and technology. Now it is classified and summarized. Grasping the following formulas will help improve problem solving and application skills. First, the formula formula 1: S_△ = 1/2ah. Where a is the length of the base and h is high. It is the basic formula for calculating the area of ​​a triangle. Formula 2: S_Δ=(p(p-a)(p-b)(p-c))~(1/2). Where a, b, c are the lengths of the three sides of the triangle, and p =