Câu 2: Trang 140 sách giáo khoa (SGK) toán tiếng anh lớp 4In rhombus ABCD, AC and BD are the two...

b) Use the concept of midsegment of a rhombus to show that the two diagonal lines intersect at the midpoint.

a) The two diagonal lines are perpendicular if the slopes of the lines are negative reciprocals of each other.

b) Use the distance formula to calculate the lengths of the diagonal lines and compare them to determine if they intersect at the midpoint.

a) No, the two diagonal lines are not perpendicular to each other if the lengths of diagonal lines are not equal and they do not intersect at 90 degrees.

b) To check if the diagonal lines intersect at the midpoint, use the midpoint formula to find the midpoint of each diagonal and see if they coincide.