Answer:
19.2
Step-by-step explanation:
Cosine rule :
[tex] \sqrt{a^{2} +b^{2} ﹣2abcos(angle ) } [/tex]
c will always be the hypotenuse.
a and b can be any if the opposite or the adjacent.
[tex] {15}^{2} + 12^{2} - 2 \times 15 \times 12 \times \cos(90) = 369[/tex]
\sqrt{369}=19.20937...
