Respuesta :

Answer:

BC= 9cm

Step-by-step explanation:

  • You'll need to use the Pythagorean theorem:

a^2 + b^2 = c^2

  • 12^2 + b^2 = 15^2

The slanted side of the triangle is always going to be 'c' because it is the longest side of the triangle.

  • Now simplify:   144 + b^2 = 225

I got these numbers because 12^2= 144 and 15^2= 225

  • Subtract.   225 - 144 = 81

  • Now find the square root of 81. The answer is 9.

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