s = 1/2 keliling segitiga
s = 1/2 ( 15 + 12 + 9)
s = 18
L = √s(s - a)(s - b)(s - c)
L = √18(18 - 15)(18 - 12)(18 - 9)
L = √18 x 3 x 6 x 9
L = √2916
L = 54 cm²
L = 1/2 (DF x EG)
54 = 1/2 ( 15 x EG)
108 = 15 x EG
EG = 108/15
EG = 7,2 cm
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s = 1/2 keliling segitiga
s = 1/2 ( 15 + 12 + 9)
s = 18
L = √s(s - a)(s - b)(s - c)
L = √18(18 - 15)(18 - 12)(18 - 9)
L = √18 x 3 x 6 x 9
L = √2916
L = 54 cm²
L = 1/2 (DF x EG)
54 = 1/2 ( 15 x EG)
108 = 15 x EG
EG = 108/15
EG = 7,2 cm