tolong banget segera dijawab, Terima kasih
Diketahui
AB = 12 cm
AC = x + 3
L = 30 cm²
Hence,
L = 1/2 . alas . tinggi
L = 1/2 . AB . AC
30 = 1/2 . 12 . (x + 3)
30 = 6 . (x + 3)
30 = 6x + 18
12 = 6x
x = 2 cm
AC = x + 3
AC = 2 + 3
AC = 5 cm
BC² = AC² + AB²
BC² = 5² + 12²
BC² = 25 + 144
BC² = 169
BC = √169
BC = 13 cm
K = AB + AC + BC
K = 12 + 5 + 13
K = 30 cm
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