Question

Tính độ dài của sợi dây thép dùng để uốn thàng bông hoa . Đường kính là 9cm .

Answer 1

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.

Answer 2

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.

Answer 3

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

Answer 4

Ai cho sai nêu lí do đi

Answer 5

Lê Thị Ngọc Tiên bắt chước..

Answer 6

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

Answer 7

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

Answer 8

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

Answer 9

có chắn là bài này đúng ko? 

 

 

 

Answer 10

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

Answer 11

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

Mọi người k cho mình nha!

Answer 12

that vong

Answer 13

khôn như mích

Answer 14

hinh ben duoc tào boi

Answer 15

56,52 cm

Answer 16

56,52 đấy 

Answer 17

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

Answer 18

ok 100phan tram thank your

Answer 19

có ai muốn kết bạn với mình không

Answer 20

mình mà đúng bài này bao bạn đi ăn chè luôn

Answer 21

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

Answer 22

chung may that dien ro

Answer 23

viet bieu thuc ngu a

Answer 24

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

Answer 25

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Answer 26

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