1. Inverse ratio because triangle area = bottom * height /2, because the area is certain, the bigger the bottom, the smaller it is, and vice versa.

2. Proportion Because the area of a circle is equal to r 2, the larger the radius, the larger the area.

3. The greater the inverse radius, the fewer the turns.

4. The more inverse time, the slower the speed.

5. Proportional area = length * width, that is, length = area/width, and the length is certain, so the larger the area, the greater the width.

6. The numerical value given shows that the rectangular area is a fixed value of 6, so the length and width must be inversely proportional.