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If the inequality is > or< then it is an open circle. If it is greater than or equal to or less than or equal to, it is a closed circle.
In a circle graph it is easier to see shares of the total than in other kinds of graphs.
It is easier because the legs carry the whole weight of the body and if you lift it for a longer time your balance will go.
In an inequality, you have to shade a side of a line to see show if the possible answers are greater than or equal to it
circle graphs create a visual picture of a proportion compared to a whole. Sometimes it is easier to see 25% of this, 15 % of that, and 60 % of something in a circle graph than to hear someone verbally say it to you. Also, you can easily compare two percentages together.