L = 22/7 x r2
1.386 = 22/7 x r2
r2 = 1.386 : 22/7
r2 = 1.386 x 7/22
r2 = 441
r = 21(maka d = 42)
k = 22/7 x d
= 22/7 x 42
= 132 cm
.Jari Jari = 11cm
Diameternya Adalah = 11x2 = 22cm
Maka
Keliling Lingkaran = π x d
Keliling = 3,14 x 22
Keliling = 69,08 cm
Luas Lingkaran = π x r x r
Luas = 3,14 x 11 x 11
Luas = 379,94 cm²
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1.
L = 22/7 x r2
1.386 = 22/7 x r2
r2 = 1.386 : 22/7
r2 = 1.386 x 7/22
r2 = 441
r = 21(maka d = 42)
k = 22/7 x d
= 22/7 x 42
= 132 cm
2.
.Jari Jari = 11cm
Diameternya Adalah = 11x2 = 22cm
Maka
Keliling Lingkaran = π x d
Keliling = 3,14 x 22
Keliling = 69,08 cm
Luas Lingkaran = π x r x r
Luas = 3,14 x 11 x 11
Luas = 379,94 cm²