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=360-245
=115 derajat
kebun rambutan= 90⁰
kebun mangga= 360 - (155 + 90)
= 360 - 245
= 115⁰
maka, luas perkebunan pak andri adalah :
360/115 × 23.000 m²
360/5 × 1.000 m²
72 × 1.000
72.000 m² atau 7,2 hektar (C)
Catatan :
1 hektare= 10.000 m²
1 m²= 0,0001 hektare