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1540 = 10 × 22/7 × r²
1540 / 10 = 22/7 × r²
154 = 22/7 × r²
154 : 22/7 = r²
154 × 7/22 = r²
7 × 7 = r²
49 = r²
r = √49
r = 7 cm
Maaf kalau ada kesalahan :)
7:22 x 154 = 49
√49 = 7 jadi jari jarinya 7 cm