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r = 14 cm. jadi panjang jarum = r
satu jam = 1 lintasan = 1 kali keliling lingkaran
selama 3 jam
maka :
> Keliling lingkaran = 2 x π x r
= 2 x 22/7 x 14
= 88 cm
> untuk 1 kali lintasan (1 jam), panjang lintasan = 88 cm.
> maka untuk 3 jam (6 kali lintasan) panjang lintasan = 88 cm x 3 = 264 cm
jarum menit berputar sebanyak 180 kali putaran, maka panjangnya =
panjang lintasan = 180πd
= 180 x 22/7 x 28
= 15840 cm