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((12 × (3+5+5)) : 2) - ((6×5) : 2)
((12 × 13) : 2) - (30 : 2)
78 - 15 = 63 cm^2
Jadi opsi yang tepat adalah C.63 cm^2
semoga membantu
1/2 x a x t
= 1/2 x 12 x 13
= 1/2 x 156
= 78
luas segitiga kecil =
1/2 x a x t
= 1/2 x 6 x 5
= 1/2 x 30
= 15
luas yg diarsir =
luas segitiga b - luas segitiga k
= 78 - 15 = 63 cm² (C)
smg membantuuu!!