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7850cm² = 3,14.r²
7850cm²/3,14 = r²
2500cm = r²
r = √2500
r = 50cm
Keliling lingkaran = 2.π.r
Keliling lingkaran = 2.3,14.50cm
Keliling lingkaran = 314 cm
πr²=7.850cm²
7.850=3,14r²
2.500=r²
r=50 cm
keliling= π.d
k= 3,14 × 100
k= 314 cm.
semoga jawaban diatas membantu :)