perhatikan gambar di bawah. panjang BC adalah...

AB = √12²+9²
= √144+81
= √225
= 15 cm

AC = √24²+7²
= √576+49
= √625
= 25 cm

BC = √25²-15²
= √625-225
= √400
= 20 cm (c)

maaf klo salah dan semoga membantu