Question

cho hình thang ABCD ( hình vẽ bên ) có kích thước như sau :

AB = 20cm , AH = 12cm , CD = 30 cm , CE = 16 cm

a ) Tính diện tích hình thnag ABCD  

b ) Tính diện tích hình tam giác BDE

c ) diện tích hình tam giác BDE bằng bao nhiêu phần trăm diện tích hình thang ABCD ?

Answer 1

dễ

nhưng ko muốn làm

xl

Answer 2

Giải

a ) Diện tích hình thang ABCD là :

( 20 + 30 ) x 12 : 2 = 300 ( cm² )

b ) Diện tích hình tam giác BDE là :

12 x 12 : 2 = 72 ( cm² )

c ) Diện tích hình tam giác BDE bằng số phần trăm với so diện tích hình thang ABCD là :

72 : 300 = 0,24 = 24 %

Đáp số : a ) 900 cm² 

             b ) 72 cm²

            c ) 24 %

Answer 3

a)diện tích hình thang là:

    (20+30)x12:2=300 cm2

đáy tam giác là:

    20-16=4(cm)

b)chiều  cao hình thang cũng là chiều cao tam giác nên diện tích tam giác là:

4x12:2=24(cm)

c)diện tích tam giác BDE = số % diện tích hình thang  ABCD là

24:300=0,08=8%

Đ/S:............................

k nhé.ok

Answer 4

Hình vẽ như sau :

Answer 5

sorry,mk giải sai

xin lỗi

Answer 6

diện tích hình thang abcd là :

[20+30]x12:2=300[cm2]

diện tích hình bde là 

[30+16]x12:2=276[cm2]

Answer 7

còn nữa :

câu c :trả lời bạn tự trả lời nhé

276:300=0.92=92%

Answer 8

xau wa

Answer 9

92% tớ chắc chắn thế 100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000%

Answer 10

bạn pham van tuan kiên trì quá

Answer 11

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Answer 12

88888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888

Answer 13

hình đẹp đấy

Answer 14

a) giải :

 Diện tích hình thang ABCD là :

           ( 30+ 20) x 12 : 2 = 300 ( cm2 )

 b) Diện tích hình tam giác BDE là :

           ( 30 + 16 ) x 12 : 2 =276 ( cm2 )

c)Diện tích hình tam giác BDE bằng số phần trăm diện tích hình thang ABcd là :

               276 : 300 x 100 = 92 %

                        Đáp số : a )300 cm2 

                                       b) 276 cm2 

                                       c) 92 %

Answer 15

Làm sao để vẽ dc :^