Answer:
the other guy was a moron. The answer was ~23.19. the formula as it turns out, was simple. It was 603pi/26pi. what a moron that guy, seriously. (I think this is the right formula, I got it off of a problem on Jiska but with similar numbers.
Step-by-step explanation:
https://www.jiskha.com/questions/1792321/the-lateral-area-of-a-cone-is-400-pi-cm-2-the-radius-is-10-cm-find-the-slant-height-to
