lingkaran luas 612 keliling Keliling ....cm

Mapel : Matematika

Bab : Lingkaran
______________

Seharusnya Luas = 616 cm²
Maka,

Ditanya → Keliling


Jawaban :
________
Jari jari
= √[Luas/π]
= √[616/22/7]
= √[616 x 7/22]
= √196
= 14 cm

Sehingga Keliling :
= 2 x 22/7 x 14
= 44 x 2
= 88 cm

luas = πr²
612 = (3,14) r²
r² = 612/3,14 = 194,9
r= √194,9 = 13,96 cm

keliling = 2πr
= 2(3,14)(13,96)
= 87,6 cm.

semoga bermanfaat.