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The height of a triangle is constant. Is the area proportional to the length of its base?
Proportional area × 2: bottom edge length = high (certain)
The trapezoid has a certain area, and the sum of its top and bottom is equal to the height ()
A. In proportion B. in inverse proportion C. out of proportion
Because the sum of the two bottoms of the trapezoid × height = the area of the trapezoid × 2 (certain), the product is certain, so the sum of the two bottoms of the trapezoid is inversely proportional to the height
The bottom of a triangle is 10, and its area and height are in direct proportion. Why?
The bottom is 10 cm
Explain the reason with a formula
Because the area of the triangle is 1 / 2 of the bottom * height
As the height becomes larger and smaller, the area becomes larger and smaller
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