Luas lingkaran 1.386 dm. Berapa cm kelilingnya
Matematika
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Pertanyaan
Luas lingkaran 1.386 dm. Berapa cm kelilingnya
2 Jawaban
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1. Jawaban Dirafbrna
L = 1386
π × r² = 1386
22/7 × r² = 1386
r² = 1386 : 22/7
r² = 1386 × 7/22
r = √441
r = 21 cm
K = 2 × π × r
K = 2 × 22/7 × 21 cm
K = 132 cm
Semoga membantu -
2. Jawaban Fhanny001
L = phi x r²
1386 = 22/7.r²
1386 x 7 = 22.r²
9702 = 22.r²
r² = 9702/22
r² = 441
r = √441
r = 21 dm = 210 cm
K = phi.d
= 22/7 x 420
= 1320 cm