r = 12 cm
keliling = 3 x r
keliling = 3 x 12 = 36 cm
s = keliling / 2
s = 36/2 = 18 cm
luas = √[s(s-r)³]
luas = √[18(18-12)³] = 36√3 cm²
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Verified answer
r = 12 cm
keliling = 3 x r
keliling = 3 x 12 = 36 cm
s = keliling / 2
s = 36/2 = 18 cm
luas = √[s(s-r)³]
luas = √[18(18-12)³] = 36√3 cm²