Diketahui luas lingkaran 1.256 cm2 . Tentukan diameternya! (Phi = 3,14)

Luas Lingkaran
1.256 = π x r²
1.256 = 3,14 x r²
1.256 = 3,14r²
r² = 1.254 ÷ 3,14
r² = 400
r = 20

Diameter = 2 x 20 = 40 Cm


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[DAMNATION]™

Diketahui : L. lingkaran = 1.256 cm^2
Ditanya : Diameter(d) = ......?
jawab : L = phi × r^2
1.256 cm^2 = 3,14 × r^2
1.256 / 3,14 = r^2
400 = r^2
akar 400 = r
20 cm = r
d = 2r
d = 2 × 20
d = 40 cm