The bottom of a triangle is 10 cm. Is its area proportional to its height? Why?

No matter how the area and height change, their ratio, that is, the bottom, is always the same

What is the area of a triangle when the bottom of the triangle is 10 cm and the height is 9 cm measured by reducing the triangle by 1:3

Original triangle bottom = 10 * 3 = 30, height = 9 * 3 = 27
Area = 1 / 2 * 30 * 27 = 405

Judge whether the two quantities are in proportion: the height of the triangle is fixed, and whether the bottom and area are in proportion

The height of a triangle is fixed, and its base is in direct proportion to its area
Because 0.5 * height * bottom = area
So the height of the triangle is fixed, and the base is in direct proportion to the area

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