Pliss bantu aku besok dikumpulin

Luas permukaan
2x {(pxl) + ( p x t ) + ( l x t )
2 x {(15 x 11 ) + ( 15 x 9) + ( 11 x 9 )
= 2 x ( 165 ) + ( 135) + ( 99)
= 2 x 399
= 798 cm2

26. L = 2 × (p×l + p×t + l×t)

= 2 × (15×11 + 15×9 + 11×9)

= 2 × (165 + 135 + 99)

= 2 × 399

= 798 cm^2 (A)


27. (C)


28. V = La × T

480 = (1/2 × A × T) × T

480 = (1/2 × 8 × 6) × T

480 = (1 × 4 × 6) × T

480 = 24 × T

T = 480 ÷ 24

T = 20 cm (D)



29. L = La + 4 × L. segitiga

= 144 + 4 × (1/2 × A × T)

= 144 + 4 × (1/2 × 12 × 8)

= 144 + 4 × (1 × 6 × 8)

= 144 + 4 × 48

= 144 + 192

= 336 cm^2



30. V = 1/3 × La × T

= 1/3 × 240 × 30

= 1 × 240 × 10

= 2.400 cm^3 (B)