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dan setengah lingkaran kecil = 1/2 Θ₂
diketahui :
r 1/2 Θ₁ = 5
r 1/2 Θ₂ = 2,5
π = 3,14
ditanya : K 1/2 Θ yang diarsir..?
jawab :
K 1/2 Θ₁ = 2 × π × r
= 2 × 3,14 × 5
= 31,4
K 1/2 Θ₂ = 2 × π × r
= 2 × 3,14 × 2,5
= 15,7
jadi Keliling semua yang diarsir = 31,4 + 15,7 = 47,1