3. consider an isosceles triangle a with base 10 and height 12. consider another triangle b formed using vertices which are the center of the sides of triangle a. consider another triangle c whose vertices are similarly formed from b. repeat this process ad infinitum. express the sum of the areas of all such triangles using a series and its closed form sum. compute the areas (a) by using only the first two terms of the series and (b) by using the closed form of the series sum