Câu 3: Trang 89 - Toán tiếng anh lớp 5:The area of rectangle ABCD is 2400 cm2(as shown...

Therefore, the area of triangle MDC is 1200 cm2.

The triangle MDC is half of rectangle ABCD in area, so the area of triangle MDC is 1200 cm2.

To find the area of triangle MDC, we just need to consider one of the triangles and calculate its area.

Since the rectangle ABCD is made up of two triangles (MDC and MAB) which are equal in area, each triangle has an area of 1200 cm2.

From the given information, we know that the area of rectangle ABCD is 2400 cm2.