Question by Summer Clouds

23/11/2017 at 15:44

Trần Quỳnh Anh 27/12/2017 at 20:59

S dodecagon = S original rectangle - S removed squares

S original rectangle = 4.5=20 (cm²)

S removed squares = 1².4=4 (cm²)

So S dodecagon = 20-4=16 (cm²)
Lê Quốc Trần Anh Coordinator 23/11/2017 at 17:57

The area of the dodecagon is: \(4\cdot5-\left(1^2\cdot4\right)=20-4=16\left(cm^2\right)\)
Phan Thanh Tinh Coordinator 23/11/2017 at 19:18

The area of the original rectangle is : 4 x 5 = 20 (cm²)

The total area of the removed squares is : 1² x 4 = 4 (cm²)

The answer is : 20 - 4 = 16 (cm²)
Dao Trong Luan Coordinator 23/11/2017 at 17:55

The area of rectangle is: 5.4 = 20 [cm²]

The area of each small square is: \(\left(5-4\right)\left(5-4\right)=1\) [cm²]

So the area of the dodecagon is: 20 - 1.4 = 16 [cm²]