Answer:
9
Step-by-step explanation:
9 squared + 12 squared= 15 squared
hi
we can do this with Pthyagorean teorem
[tex] {12}^{2} + {x}^{2} = {15}^{2} \\ 144 + {x}^{2} = 225 \\ {x}^{2} = 225 - 144 \\ {x}^{2} = 81 \\ x = \sqrt{81} \\ x = 9 \: cm[/tex]
BC is 9
hope it helps
have a nice day
