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Rumus luas lingkaran :
L = π × r × r
L = π × r²
Jawaban :
Diketahui ; luasnya 1,326 dm²
π = 22/7
r² = 22/7 ÷ 1326
r² = 7/22 × 1326
r² = 9282/22
r² = 421,91
r = √421,91
r = 20,54 dm