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= 3,14 x 9 cm x 9 cm
= 254,34 cm²
Luas lingkaran besar = x r²
= x 21 cm x 21 cm
= 1386 cm²
Selisih = 1386 cm² - 254,34 cm²
= 1131,66 cm²
r₂ = jari jari kecil
πr₁² : πr₂²
22/7 x 21² : 22/7 x 9²
21² : 9²
441 : 81
49 : 9
selisih = 49 - 9 = 40