Question

Mohon bantuannya, jangan ngasal​

Answer 1

Penjelasan dengan langkah-langkah:

1. pk = 15 m

lk = 10 m

pj = 15+1+1 = 17 m

lj = 10+1+1 = 12 m

Luas keramik = pj x lj – pk x lk

= 17 x 12 – 15 x 10

= 204 – 150

= 54 m²

2. Luas B.K = d1 × d2/2

d1 = 2x + 3

d1 = 2 × Luas/d2

2x + 3 = 2× 81/18

2x + 3 = 162/18

2x + 3 = 9 cm

2x = 9 – 3

2x = 6

x = 6/2

x = 3 cm

3. t = √(5² – [15 – 12]²)

t = √(25 – 9)

t = √16

t = 4 cm

Luas = (12+15) x 4/2

Luas = 27 x 2

Luas = 54 cm²

4. Luas kertas = 36 x 20/2

= 36 x 10

= 360 cm²