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K= 28 + 28 + K lingkaran = 56 + 2 x 7 x 22/7 = 56 + 44 = 100 cm
gmbr kanan
K = 21+21+21 + 1/2 x 21 x 22/7 = 63 + 33 = 96 cm
keliling persegi panjang :
2(p+l)
2(28+14)
2(42)
84 cm
keliling lingkaran :
π × d
22/7 × 14
22 × 2
44 cm
keliling daerah yang diarsir :
84 - 44
40 cm
Gambar 2
keliling persegi :
3 × s
3 × 21
63 cm
keliling 1/2 lingkaran :
1/2 × π × d
1/2 × 22/7 × 21
11 × 3
33 cm
keliling daerah yang diarsir :
63 + 33
96 cm