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= 1/2 x 4 x 3
= 6 cm2
b. Keliling = 4 + 3 + 5 = 12 cm
= 1/2 x alas x tinggi
= 1/2 x 4 cm x 3 cm = 6 cm²
B.Keliling segitiga adalah
= jumlah semua sisi
= panjang sisi AB + panjang sisi BC + panjang sisi AC
= 3 cm + 4 cm + 5 cm = 12 cm