Câu 1: trang 179 - toán tiếng anh lớp 5A square cardboard is shaded as shown in the figure....

b) Substracting the length of the shaded part from the perimeter of the square will give us the perimeter of the unshaded part.

b) The perimeter of a square is the sum of all its sides. So, the perimeter of the square is 4 times the side length.

b) To find the perimeter of the unshaded part, we need to calculate the perimeter of the entire square first.

a) Let's assume the side length of the square is 'x' units. Therefore, the area of the shaded part is x^2.

a) The side length of the square can be found by measuring the length of one side of the shaded part.