Question

[THT]

Tính chu vi hình tròn có đường kính d, biết :

a) d = 1,5 dm

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b) d = 5cm

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c) d = 1/3 dm

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Answer 1

[Lê Anh Tú]

a) Chu vi:

1,5 x 3,14 = 4,71 ( dm )

b) Chu vi:

5 x 3,14 = 15,7 ( cm )

c) Chu vi:

\(\frac{1}{3}\)x 3,14 = \(\frac{157}{150}\)( dm )

Đ/S: ..........

Answer 2

[We Are One]

A,: 4,71 DM

B,:15.7CM