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Verified answer
Bab Barisan dan DeretMatematika SMP Kelas VIII
Aritmatika
Sn = 183 cm
b = 7 cm
n = 6
Sn = (n/2) x (2a + (n - 1) b)
S6 = 183
(6/2) x (2a + 5b) = 183
3 x (2a + 5 x 7) = 183
2a + 35 = 183 : 3
2a = 61 - 35
a = 26/2
a = 13 cm
U6 = a + 5 x b
U6 = 13 + 5 x 7
U6 = 13 + 35
U6 = 48 cm
panjang pita bagian pertama = 13 cm
panjang pita bagian terakhir = 48 cm