x + x + 1 + x + 2 = 12
3x + 3 = 12
3x = 12 - 3
3x = 9
x = 3
alas = x = 3
tinggi = x + 1 = 3 + 1 = 4
Luas segitiga
= 1/2 × alas × tinggi
= 1/2 × 3 × 4
= 6 cm²
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x + x + 1 + x + 2 = 12
3x + 3 = 12
3x = 12 - 3
3x = 9
x = 3
alas = x = 3
tinggi = x + 1 = 3 + 1 = 4
Luas segitiga
= 1/2 × alas × tinggi
= 1/2 × 3 × 4
= 6 cm²