19. AB = 3 CM, BC = 4 CM, luas = ?
Cari AC
√3^2 + 4^2
= √9 + 16
= √25
= 5 CM
Luas = 1/2 × AB × AC
= 1/2 × 3 × 5
= 7, 5 cm^2
Jadi, luas segitiga ABC = 7,5 cm^2
20. Keliling = 8 CM + 10 CM + 12 CM
= 30 CM
Jadi, keliling segitiga ABC = 30 cm
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19. AB = 3 CM, BC = 4 CM, luas = ?
Cari AC
√3^2 + 4^2
= √9 + 16
= √25
= 5 CM
Luas = 1/2 × AB × AC
= 1/2 × 3 × 5
= 7, 5 cm^2
Jadi, luas segitiga ABC = 7,5 cm^2
20. Keliling = 8 CM + 10 CM + 12 CM
= 30 CM
Jadi, keliling segitiga ABC = 30 cm