sebuah lingkaran luasnya 1.386 cm².keliling lingkaran tersebut adalah? A.264 B.196 C.176 D.132 tolong dijawab beserta caranya ya•_•

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Mapel : Matematika
Tentang : Bangun Datar
Pertanyaan yg diajukan : 1
Pembahasan :

Diketahui :
- Luas (L) = 1386 cm²

Ditanya :
- Keliling (K)

L = π x r²
1386 = 22/7 x r²
r² = 1386/22/7
r² = 1386 x 7/22
r = √441
r = 21 cm

d = 21 x 2
d = 42 cm

K = π x d
K = 22/7 x 42
K = 22 x 6
K = 132 cm

Jawaban : D

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