jika luas lingkaran 616 vm² , maka keliling lingkaran?

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

Diketahui :
- Luas (L) : 616 cm²

Ditanya :
- Keliling (K)

- Cara :

L = π x r²
616 = 22/7 x r²
r² = 616/22/7
r² = 616 x 7/22
r² = 28 x 7
r = √196
r = 14 cm
d = 14 x 2 = 28 cm

K = π x d
K = 22/7 x 28
K = 22 x 4
K = 88 cm

Jawaban : 88 cm

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Heil Manstein!

Luas lingkaran = π × r × r
Luas lingkaran = 616 cm2

r = 616 ÷ π
r = 616 ÷ 22/7
r = 616 × 7/22
r = 196
r = √196
r = 14 cm

Keliling = 2 × π ×r
Keliling = 2 × 22/7 × 14
Keliling = 88 cm