A. 3.14
B. 15.7
C. 22.7
D. 31.4
Penjelasan dengan langkah-langkah:
Panjang jari-jari.
L = π × r × r
78,5 m² = 3,14 × r × r
78,5 m² = 3,14 × r²
78,5 m ÷ 3,14 = r²
r² = √25
r = 5 m
Keliling
K = 2 × π × r
K = 2 × 3,14 × 5 m
K = 6,28 × 5 m
K = 31,4 m
Maka jawaban:
- Opsi d.
Sekian dan terimakasih!
[tex] \: [/tex]
Diketahui :
luas = 78,5 m²
Ditanya :
keliling ... ?
Jawaban :
- cari jari² nya terlebih dahulu
L = πr²
78,5 = 3,14 × r²
r² = 78,5 ÷ 3,14
r² = √25
r = 25 m
- keliling
kll = 2πr
= 2 × 3,14 × 25
= 157 m
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