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Rumus Panjang Tali = p = n d + πd
n = banyak lingkaran
d = diameter lingkaran
π = 3,14 atau 22/7
1) n = 2 , r = 7 --> d = 14
p = nd + πd
p= 2(14) + 22/7 (14)
p= 28 + 44
p = 72 cm
2) n = 3,d= 14
p =nd + πd
p = 3(14)+ 22/7 (14)
p = 42 + 44
p = 86 cm
3) n = 3, d = 7,6
p = 3d + πd
p = 3(7,6) +3,14 (7,6)
p = 46,664 cm
4) n= 6 , d = 10
P = 6 d + πd
p= 6(10) + (3,14)(10)
p= 60 + 31,4
p = 91,4 cm
5) n = 6, r = 20 --> d = 40
p = 6d + πd
p = 6(40) + (3.,14)(40)
p = 240 + 125,6 = 365,6 cm
6) hitung banyak lingkaran terluar --> n = 12 , d= 60 cm
p = 12 d + πd
p = 12(60) + (3,14)(60)
p= 720 + 188.4 = 908,4 cm
p = nr + 2πr
p = 4× 7 + 2(22/7) × 7
p = 28 + 44
p = 72 cm
No.2
p = nr + 2πr
p = 8×7 × 2 (22/7) × 7
p = 56 + 44
p = 100 cm