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Keliling = 88 cm
Ditanya =
Luas?
Jika ditanya luas ,juga pasti harus mencari jari jari maka r=?
Keliling = 2 . π . r
88 cm = 2 . 22/7 . r
22/7 . r = 88÷2 = 44 cm
r = 44 ÷ 22/7
r = 44 x 7/22
r = 14 cm
Luas = π . r^2
luas = 22/7 . 14^2
luas = 22/7 . 196
luas = 616 cm2.
Dit : L.lingkaran ... ??
K.Lingkaran = 2 π r =
88 cm = 2 x 22/7 x r
88 cm = 44/7 x r
r = 88x7/44
r = 2 x 7 = 14
L.lingkaran = πr² = 22/7 x 14 x 14
L.lingkaran = 22 x 14 x 2 = 616
priksa kmbali