Consider the running track which consists of two straight paths each measuring 84 meters in length and two semicircles with diameter, d.
What is the diameter, d, in meters, if the distance around the track is 400 meters? Round your answer to the nearest tenth.
![Consider the running track which consists of two straight paths each measuring 84 meters in length and two semicircles with diameter dWhat is the diameter d in class=](https://us-static.z-dn.net/files/d9c/f0c9b28e0e209c95b89a4f4b1510803e.jpg)