luas segitiga KLM Adalah....... cm². Tolong pakai Cara!!!

L = √s(s - a)(s - b)(s - c)
a = 8
b = 12
c = 16
s = a+b+c / 2 = 8+12+16 / 2 = 36/2 = 18

L = √18(18 - 8)(18 - 12)(18 - 16)
L = √18(10)(6)(2)
L = √2160
L = √144 × 15
L = 12√15