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1 k cho tui đi

Mở rộng bài toán: khi đó kim giây(s) lại vuông góc đường thẳng đó ? khi đó là mấy giờ

=66

tk mk

mk tk lại

thanks

1 + 2 + 3 = 3 + 3 

                  = 6 

Vậy 1 + 2 + 3 = 6

25901 mik

2 day

k minh nha

Vì 9,5 x 9,5 = 90,25 

=> Cạnh của hình vuông là 9,5 m

Vậy chu vi hình vuông đó là :
9,5 x 4 = 38 (m)

Đáp số : 38 m.