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Một cái sân hình chữ nhật có chu vi 50m, chiều dài hơn chiều rộng 10m . Người ta đào một cái ao hình tam giác có cạnh đáy 5,2 m và chiều cao 4,9m . Tính diện tích miếng đất còn lại .

Trần Mỹ Anh
22 tháng 2 2016 lúc 17:33

Nửa P là : 50 : 2 = 25 ( m )

CD là : ( 25 + 10 ) : 2 = 17,5 ( m )

CR là : ( 25 - 10 ) : 2 = 7,5 ( m )

S cái sân HCN đó là : 17,5 x 7,5 = 131,25 ( m2 )

S cái ao HTG là : 5,2 x 4,9 : 2 =12,74 ( m2 )

S miếng đất còn lại là : 131,25 - 12,74 = 118,51 ( m2 ) 

Nguyễn Thị Mai
22 tháng 2 2016 lúc 17:38

nửa chu vi cái sân hình chữ nhật là :

       50 : 2 = 25 ( m )

chiều dài cái sân hình chữ nhật là : 

        ( 25 + 10 ) : 2 = 17, 5 ( m )

chiều rộng cái sân hình chữ nhật là :

       25 - 17, 5 = 7, 5 ( m )

diện tích cái sân hình chữ nhật là : 

          17, 5 x 7, 5 = 131, 25 (m2 )

diện tích cái ao hình tam giác là : 

            5, 2 x 4, 9 : 2 = 12 , 74 ( m2 )

diện tích miếng đất còn lại là : 

             131 , 25 - 12 , 74 = 118 , 51 ( m2 )

                                        đáp số : 118 , 51 m2 .

VRCT_Phương Thảo
1 tháng 6 2016 lúc 9:04

118,51m2

๖ۣۜкαŋşʉкε♡
14 tháng 1 2019 lúc 19:10

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