Respuesta :

Phobic111

Answer:

b = 12mm

Step-by-step explanation:

Using pythagoras theorem, you will be able to find the answer.

a² = b² + c²

15² = b² + 9²

b² = 15 ² - 9²

b² = 144

b = [tex]\sqrt{144}[/tex]

∴ b= 12mm