Given the following information, calculate the perimeter of triangle RST. Assume triangle RZX is similar to triangle RST.
RZ = 21, RY = 24, RX = 42, ZY = 9, and SW = 15.
![Given the following information calculate the perimeter of triangle RST Assume triangle RZX is similar to triangle RST RZ 21 RY 24 RX 42 ZY 9 and SW 15 class=](https://us-static.z-dn.net/files/d40/1f84644db3c9702822c2595a54330fa8.png)