Question

Tolong dijawab ya no 13&20 beserta caranya terima kasih

Answer 1

Verified answer

Bab Bangun Datar dan Perbandingan
Matematika SD Kelas VI

13] Persegi panjang
   
Keliling = 30
2 x (p+ l) = 30
1 + l + l = 30 : 2
2l = 15 - 1
l = 14/2
l = 7 cm

p = l + 1
  = 7 + 1
   = 8 cm

luas = p x l
        = 8 x 7
        = 56 cm²

20] R = (2/3) S

     R + 6 + S + 6 = 42
     (2/3) S + S = 42 - 12
    (5/2) S = 30
    S = 30 x 2/5
    S = 12 tahun

    R = (2/3) x s
        = (2/3) x 12
        = 8 tahun

Selisih usia mereka = 12 + 8
                                = 4 tahun