Question

Tolong Bantuin Soal No 4-8​

Answer 1

4. 1,4,9 ( C)

5. misal tinggi balok = t

luas balok = 2((8x6) +(8t) + (6t) )= 188

48 + 8 t + 6t = 188/2 = 94

14t = 94-48 = 44

t = 44/14 = 3,14 cm

6. L jaring = 2x( (pxl)+(pxt)+(lxt))= 484

p x (l+t) + (l x t) = 484/2 = 242

7. luas dinding = 2(p+l) x t

= 2(9+7) x 4 = 8 x 16 = 128 m²

biaya = 128 x 50.000 = 6.400.000 (B)

8. misal p = 4x, l = 3x dan t = 2x

4x X 3x = 108

12 x² = 108

x² = 108/12 = 9

x = √9 = 3

maka p = 4 x 3 = 12 cm

l = 3 x 3 = 9 cm

t = 2 x 3 = 6 cm

Luas = 2 x[ (pxl) +(pxt)+(lxt)]

= 2 x [(12x9)+(12x6)+(6x9)]

= 2 x ( 108 + 72 + 54)

= 2 x 234 = 468 cm²