Question

Jawab 1-4 jangan ngasal

pakai cara

Answer 1

1.) L trapesium = 1/2 × (a + b) × t

= 1/2 × (18 + 15) × 12

= 1/2 × 33 × 12

= 198 cm² ✔

2.) L trapesium = 1/2 × (a + b) × t

= 1/2 × (28 + 24) × 19

= 1/2 × 52 × 19

= 494 cm² ✔

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Answer 2

1. Cara 1 : Uraikan jadi bangun yang bisa dikenal :

Luas bangun = L.Persegi Panjang + L.Segitiga

                     = p.l + 1/2 at <= t = p = 12 cm , a = 18 - 15 = 3 cm , l = 15 cm

                     = 12.15+1/2.3.12

                     = 12.15+6.3

                     = 6(2.15+3)

                    = 6(30+3)

                    = 180+18

L = 198 cm²

cara 2 : Pake rumus Luas Trapesium :

L = 1/2 . (a1+a2).t <= t = 12 cm , a1 = 15 , a2 = 18 cm

L = 1/2(15+18) . 12

  = 33 . 6

L = 198 cm²

4.L = L.PP + L.S

     = p.l + 1/2 at <= t = p = 19 cm , l = 24 cm , a = 28 - 24 = 4 cm

    = 19.24+1/2.4.19

    = 19(24 + 2)

   = (20-1)(24+2)

  = 480+40 - 24 - 2

 = 496 - 2

L = 494 cm²