In the xy-plane, the vertices of triangle RST have coordinates (-k,k), (k, 2k), and (k+2, k), as shown. What is the area of triangle RST in terms of k?
In the xy-plane, the vertices of triangle RST have coordinates (-k,k), (k, 2k), and (k+2, k), as shown. What is the area of triangle RST in terms of k?