The bottom of a triangle is 6cm, and the height is 4cm. Enlarge the triangle by 2:1, and the area of the figure is several square centimeters

(6 * 2) * (4 * 2) / 2 = 48 square centimeter

A triangle with a height of 3cm and a height of 5cm is enlarged by 4:1. What is the area of the figure?

After magnification, the bottom is 5 × 4 = 20, and the height is 3 × 4 = 12
Area = 20 × 12 △ 2 = 120 square centimeter

The area of a triangle is 22.5 square centimeters less than that of a parallelogram with the same base and height. The area of a parallelogram is the area of a triangle
The last sentence is: the area of the triangle is []

The area of a parallelogram is equal to the base times the height, and the area formula of a triangle is the base times the height divided by 2, so the area of a parallelogram with the same base and height is twice that of a triangle. So in the above example, the area of a parallelogram is 22.5 * 2 = 45, and the area of a triangle is 22.5

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The bottom of a triangle is 6cm, and the height is 4cm. Enlarge the triangle by 2:1, and the area of the figure is several square centimeters