If she increases each of the rectangle’s dimensions by 43 units, the area of the rectangle increasesby 2021 square units. Compute the perimeter of the original rectangle Anna pictured

The pyraminx is a rubik's cube-type toy in the shape of a tetrahedron. the pyraminx shown below has edges 15\,\text{cm}15cm long and vertical height h=12.2\,\text{cm}h=12.2cm. the triangle drawn with dashed lines is a right triangle. what is the distance rr? round your answer to the nearest tenth.