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= √12²+9²
= 15 cm
s = 1/2 (9+12+15) = 18
LΔ = √18(18-9)(18-12)(18-15)
= √18(9)(6)(3)
= √2916
= 54 cm²
Luas Layang-layang = 2.LΔ = 2.54 = 108cm²