Chu vi một nửa hình tròn là:

      9 x 3,14 = 28,26 (cm)

Chu vi 4 nửa hình tròn là:

      28,26 x 4 = 113,04 (cm)

Độ dài sợi dây thép đó là:

      113,04 : 2 = 56,52 (cm)

               Đáp số : 56,52 cm.

Chu vi một nửa hình tròn là:

      9 x 3,14 = 28,26 (cm)

Chu vi 4 nửa hình tròn là:

      28,26 x 4 = 113,04 (cm)

Độ dài sợi dây thép đó là:

      113,04 : 2 = 56,52 (cm)

               Đáp số : 56,52 cm.

Mỗi cánh hoa nữa hình tròn : 1/2 x4 = 2 hình tròn

Chu vi 2 hình tròn = độ dài sợi dây = 2 x 9 x 3,14 = 56,52 cm

Ai cho sai nêu lí do đi

Lê Thị Ngọc Tiên bắt chước..

Chu vi nửa hình tròn là:

9 x 3,14 = 28,26 (cm)

Chu vi 4 nửa hình tròn là:

28,26 x 4 = 113,04 (cm)

Độ dài sợi dây thép đó là:

113,04 : 2 = 56,52 (cm)

Đáp số : 56,52 cm

Đáp án của Đỗ Phương Thảo có vấn đề vì mỗi cánh hoa là nửa hình tròn vậy nên tính chu vi xong phai chia 2 chứ

Chu vi một nửa hình tròn là:
9 x 3,14 : 2 = 14,13 (cm)
Độ dài của sợi dây thép là:
14,13 x 4 = 56,52 (cm)
Đáp số: 56,52cm

có chắn là bài này đúng ko? 

bn lê quang thế ​về hình đẹp thật nhưng mà bn ko về giống trong sách gì hết

Độ dài của sợi dây thép dùng để uốn thàng bông hoa là: 56,52 cm.

Mọi người k cho mình nha!

that vong

khôn như mích

hinh ben duoc tào boi

56,52 cm

56,52 đấy 

sai hết, chỉ có Văn Lê Hạnh Nhân là đúng thôi

ok 100phan tram thank your

có ai muốn kết bạn với mình không

mình mà đúng bài này bao bạn đi ăn chè luôn

giai

chu vi 1/4 day thep hinh bong hoa la: 9*3,14:2=14,13[cm]

chu vi day thep hình bông hoa là: 14,13*4=56,52[cm]

d/s: 56,52 cm

chung may that dien ro

viet bieu thuc ngu a

đáp án là 56,52nhe bạn.không biết có đúng ko

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