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Yang diketahui jari-jari = π × r²
Yang diketahui diameter = (dibagi dua dulu lalu tinggal π × r²)
Contoh :
Luas lingkaran
a. Jari-jari 7 cm
π × r²
22/7 × 7 cm × 7 cm = 154 cm²
b. Diameter 28 cm
28 cm ÷ 2 = 14 cm
π × r²
22/7 × 14 cm × 14 cm = 616 cm²