Câu 2: Trang 143 sách giáo khoa (SGK) toán tiếng Anh lớp 4A rhombus-shaped piece of glass has a...

You can also calculate the area of a rhombus by dividing it into two congruent triangles and then using the formula for the area of a triangle. Since the diagonals of the rhombus form four right-angled triangles, each with base 7cm and height 5cm, the total area of the rhombus is 4 times the area of one of these triangles: Area = 4 * (1/2 * base * height) = 4 * (1/2 * 7 * 5) = 70 square cm.

Another way to calculate the area of a rhombus is by using the formula: Area = (1/2) * diagonal1 * diagonal2. With diagonal1 = 14cm and diagonal2 = 10cm, the area of the glass can be calculated as: Area = (1/2) * 14 * 10 = 70 square cm.

The area of a rhombus can be calculated using the formula: Area = (d1 * d2) / 2, where d1 and d2 are the lengths of the diagonals. In this case, d1 = 14cm and d2 = 10cm. Therefore, the area of the glass can be calculated as: Area = (14 * 10) / 2 = 70 square cm.