Find the length of the third side. If necessary, round to the nearest tenth.
13
20
help please !

Answer: D, 15.2
Step-by-step explanation:
use formula a^2 + b^2 = c^2
a^2 + 13^2 = 20^2
a^2 + 169 = 400
- 169 -169
a^2 = 231
sqrt sqrt
a = sqrt(231)
a = 15.198 = 15.2