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Keliling₁ = π * D₁ = π * 2,168 = 6,81 cm
Anggap cincinya adalah emas
koefisien muai panjang emas, α = 0,000014/°C
T₁ = 15
T₂ = 100
ΔT = 100 - 15 = 85 °C
keliling₂ = ?
Keliling₂ = keliling₁ (1 + α * ΔT)
Keliling₂ = 6,81 (1 + 0,000014 * 85) = 6,8181 cm
keliling₂ = π * D₂
6,8181 = 3,14 * D₂
D₂ = 2,170 cm