Drag the vertices of the triangle below to draw a triangle with 30 degrees, 50 degrees, and 100, degrees angles.
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The ratio A/r² would represent 
which is the circumference of a circle divided by its diameter.
You can see this because the area of a circle isr² and if you divided that by the radius squared, you are given pi which is the circumference of a circle divided by its diameter.
You can see this because the area of a circle is