Question

Please help please I need help

Answer 1

hi

Explanation:

we can do this with Pthyagorean teorem

`{12}^(2) + {x}^(2) = {15}^(2) \\ 144 + {x}^(2) = 225 \\ {x}^(2) = 225 - 144 \\ {x}^(2) = 81 \\ x = √(81) \\ x = 9 \: cm`

BC is 9

hope it helps

have a nice day

Answer 2

9

Explanation:

9 squared + 12 squared= 15 squared