If it is an elliptic oval, the circumference can be calculated by πab, where a and b are the lengths of the minor and major axes.
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triangle does not have a circumference, a circle has a circumference. A triangle only has a hypotenuse (Pythagoras sort of stuff). The circumference of a circle is the perimeter of it, so, perhaps, if your teacher ask for the circumference of a triangle he/she might mean the perimeter of the triangle.
A part of a circle's circumference is an arc
A tangent is a straight line that touches the outside circumference of a circle at one point whereas a chord is a straight line within a circle that spans its circumference.
A tangent is a straight line that touches a circle's circumference at one point
Assuming the '12 inch' is the radius. Then C = 2 pi r C = 2 pi 12 C = 24 pi ( Thr asnswer in terms of 'pi').