Answer:
13
Step-by-step explanation:
pythagorean theorem: a^2 + b^2 = c^2
5^2 + 12^2 = c^2
169=c^2
13=c
it's also special right triangle 5-12-13 (it's just something u remember)
JL = 13
a² + b² = c²
5² + 12² = c²
25 + 144 = c²
169 = c²
√169 = c
13 = c
