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The circle is the soil in the world, and the square is a tree coming out of the soil.
A circle graph is a pie chart
No.
It is equal to 2 r or D, where r= radius and D = diameter of the circle.
Yes it is. Pie = 3.14 or a half circle is 180 degree's where as a full circle is 360 degrees. I fly small aircraft an we always make incomplete circles, it used everyday in the world with engineers and mathematicians. Each quarter circle is 90 degrees, multiplied by 4 equals 360 degrees which is a whole circle. Hope this helped you. John U.