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Kelas : 1 SMP/VII SMP
Pembahasan :
A. Perbandingan keliling
Keliling lingkaran 1 = K1 = 2πr₁ = 2.3,14.5 = 31,4 cm
Keliling lingkaran 2 = K2 = 2πr₂ = 2.3,14.15 = 94,2 cm
K1 : K2 = 31,4 : 94,2 = 1 : 3
B. Selisih keliling
Selisih = K2 - K1 = 94,2 - 31,4 = 62,8 cm
C. Perbandingan Luas
Luas lingkaran 1 = L1 = πr₁² = 3,14.5² = 78,5 cm²
Luas lingkaran 2 = L2 = πr₂² = 3,14.15² = 706,5 cm²
L1 : L2 = 78,5 : 706,5 = 1 : 9
D. Selisih Luas
Selisih = L2 - L1 = 706,5 - 78,5 = 628 cm²