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Verified answer
Kelas 10 MatematikaBab Trigonometri
Luas jajar genjang
= 2 . luas segitiga
= 2 . 1/2 . 12 . 15 . sin 60°
= 12 . 15 . 1/2 √3
= 90 √3 cm²
Verified answer
Luas jajar genjang =2 × luas segitigaLuas jajar genjang =2 × ½ × 12 × 15 × sin 60°
Luas jajar genjang = 12 × 15 × ½ √3
Luas jajar genjang = 90 √3 cm²