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Kelas 5 MatematikaBab Bangun Datar
r = d/2
r = 20/2
r = 10 m
Panjang = 35 - 10
Panjang = 25 m
Keliling = (2 x 1/2 keliling lingkaran) + (2 x panjang)
Keliling = (2 x π x r) + (2 x 25)
Keliling = (2 x 3,14 x 10) + 50
Keliling = 62,8 + 50
Keliling = 112,8 m
Panjang kawat
= 2 x 112,8
= 225,6 m