How do I find the area and perimeter of a triangle?

To find the area and perimeter of a triangle, we need:

1.For the area. To find the area of a triangle, for example ABC, there are several ways, that is, formulas, here is the first of them: S = 1/2 * A * h, where A is the length of the side of the triangle, h is the height drawn to side A. The second formula: S = 1 / 2 * a * b * sin a, where a and b are the lengths of the sides of the triangle, sin a is the sine of the angle between sides a and b.

2. For the perimeter. To find the perimeter of a triangle for example ABC we need to measure the length of all sides of the triangle, that is, AB, BC, AC. Then fold them up. Here is the final formula P = AB + BC + AC.