Question

tinh chu vi cua hinh tron biet dt la 7,065

Answer 1

7.065 : 3.14 = 2.25 ( 1.5 x 1.5 = 2.25 nen ban kinh la 1.5 )

1.5 x 2 x 3.14 = 9.42

Chu vi = 9.42

Answer 2

chu vi la 9,42 nha

Answer 3

dt = bk*bk*3.14

=>bk*bk*3.14=7.065

bk*bk=2.25

bk*bk=1.5*1.5

=>bk=1.5

dk=3

Ta co : chu vi hinh tron la : 3*3.14=9.42