Answer:
15 units
The length of BC is 15 units.
Solution,
Hypotenuse(h)=?
perpendicular(p)=12
base(b)=9
Using Pythagoras theorem,
[tex] {h}^{2} = {p}^{2} + {b}^{2} \\ or \: {h}^{2} = {12}^{2} + {9}^{2} \\ or \: {h}^{2} = 12 \times 12 + 9 \times 9 \\ or \: {h}^{2} = 144 + 81 \\ or \: {h}^{2} = 225 \\ or \: h = \sqrt{225} \\ or \: h = \sqrt{ {15}^{2} } \\ h = 15[/tex]
hope this helps...
Good luck on your assignment....
