a) 35,27

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a) Dường kính hình tròn là:

         18,84:3,14=6(cm)

b)Bán kính hình tròn là:

          25,12:3,14:2=4(cm)

             Đáp số:...

Đường kính hình tròn đó là :

      18,84÷3,14=618,84÷3,14=6  ( cm )

Bán kính hình tròn là :

        25,12÷3,14÷2=425,12÷3,14÷2=4( cm )

                 Đáp số : a ) 66cm

                                b ) 44cm

Phân số chỉ diện tích trồng rau là:

2/5 x 3/5 = 6/25 (diện tích khu đất)

Phân số chỉ diện tích cây ăn quả là:

1 - (2/5 + 6/25) = 9/25 (diện tích khu đất)

a) Diện tích khu đất là:

90 : 9/25 = 250 (m2)

b) Diện tích trồng rau là:

250 x 6/25 = 60 (m2)

Đáp số: a) 250m2

              b) 50m2

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