In the plane rectangular coordinate system, the area of △ CEF when the line y = 2 / 3x-2 / 3 intersects with the edge OC and BC of rectangular ABCO and points E and F are known as OA = 3 and OC = 4 respectively

In the plane rectangular coordinate system, the area of △ CEF when the line y = 2 / 3x-2 / 3 intersects with the edge OC and BC of rectangular ABCO and points E and F are known as OA = 3 and OC = 4 respectively

According to the topic, point O is the origin, and a and C are on the coordinate axis. As for the axis that does not affect the required area, you can choose it by yourself. Then you can determine the coordinates of point ABC, get the linear equation where the edge is, get the coordinates of intersection E and F, that is, get the coordinates of the three top points of the triangle, then you can find the side length of the triangle, the distance between the point and the line, and get the height