Jawaban:

1a) panjang denah (pd) = 12cm

lebar denah (ld) = 7cm

luas denah (Ld) = p×l = 12 × 7 = 84cm²

skala (s) = 1:300

dit: Luas sbnrny(ls)

jwb: Ls = Ld : s

Ls = 84 : 1/300

Ls = 84 × 300

Ls = 25.200cm²

b) pd = 5cm

ld= 8cm

Ld = 5 × 8 = 40cm²

s= 1 : 350

dit : Ls

Ls = Ld : s

Ls = 40 : 1/350

Ls = 40 × 350

Ls = 14.000cm²

2. s = 1:800

Lg (Luas gambar) = p × l = 15 × 10 = 150cm²

dit: luas sbnrny (m)

jwb:

Ls = Lg × s

Ls = 150 : 1/800

Ls = 150 × 800

Ls = 120.000cm² = 12m²

3. s = 1 : 500

Ld = 20 × 12,5 = 250cm²

dit: Ls

Ls = Ld : s

Ls = 250 : 1/500

Ls = 250 × 500

Ls = 125.000cm²

more info:

• jika yg ditanya (contoh) panjang sbnrny, rumusny:

Panjang sbnrny = panjang denah : skala

• jika yg ditanya panjang denah, rumusnya:

panjang denah = skala × panjang sbnrny

•jika yg ditanya skala, rumusny:

skala = panjang denah : panjang sbnrny

semoga membantu:)