Area and Perimeter of a Triangle
Read this article and watch the videos. Pay attention to the formula for the area of a triangle, including the special case of right triangles. Note that we use the Pythagorean theorem to calculate the perimeter of a triangle.
Then, complete review questions 1–5 and check your answers.
Click https://www.ck12.org/geometry/area-and-perimeter-of-triangles/lesson/Area-and-Perimeter-of-Triangles-GEOM/ link to open resource.