D. 38 cm
Penjelasan dengan langkah-langkah:
Kita anggap salah satu sisinya yaitu panjangnya.
Luas = p × ℓ
84 = 7 × ℓ
ℓ =
ℓ = 12 cm
K = 2 × (p + l)
K = 2 × (7 + 12)
K = 2 × 19
K =
84 = p.l
84 = 7.l
84:7 = l
12 = l
K = 12+7+12+7 = 38cm
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D. 38 cm
Penjelasan dengan langkah-langkah:
Kita anggap salah satu sisinya yaitu panjangnya.
Luas = p × ℓ
84 = 7 × ℓ
ℓ =
ℓ = 12 cm
K = 2 × (p + l)
K = 2 × (7 + 12)
K = 2 × 19
K =
Penjelasan dengan langkah-langkah:
84 = p.l
84 = 7.l
84:7 = l
12 = l
K = 12+7+12+7 = 38cm