Tính chu ci , biết diện tích là 12,56 cm2
GIAI CHI TIET GIUP MINH NHE
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Đường kính hình tròn là
12,56:3,14=4
Ta thấy:2x2=4,suy ra bán kính là ư
Diện tích hình tròn là:
2x2x3,14=12,56
Đáp số:12,56
bán kính hình tròn là :
12,56 : 2 : 3,14 = 2 ( cm )
diện tích hình tròn là :
2 x 2 x 3,14 = 12,56 ( cm2 )
đáp số : 12,56 cm2
Diện tích hình tròn = bán kính x bán kính x 3,14
Vậy bán kính x bán kính = 12,56:3,14= 4
Mà: 4 = 2 x 2. Vậy bán kính hình tròn: 2(cm)
Chu vi hình tròn:
2 x 2 x 3,14= 12,56(cm)
Độ dài 1 cạnh hình vuông là:
12,56:4=3,14(cm)
Chu vi hình vuông là:
3.14 nhân 4=12,56(cm)
Đáp số:12,56 cm
chu vi hình vuông à?