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The problems you missed are listed below with answers and explanations.  Look over the explanation for each problem so you can understand why you missed it!

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A Tangent only touches one point on a circle.

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After drawing a perpendicular radius through a chord, we have bisected it. So there are 2 segements but both are the same length so there is only 1 length.

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It is possible to have congruent arcs.

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An inscribed angle does not have curved lines. It has straight lines but the vertex point of the angle touches one point along the edge of the circle.

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3.14 is an approximation of PI.

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Triangles can be inscribed in a circle. Each corner touches one point along the edge of the circle.

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Right triangles can be inscribed in a circle.

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Chords very rarely go through the center. So it is not a requirement.

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Finding the length of the chord requires more than just knowing the radius.

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No. Since the circles are different sizes, it will create the circle with the longer radius to have a larger chord.

'; rightans[0] = 1; rightans[1] = 1; rightans[2] = 1; rightans[3] = 1; rightans[4] = 1; rightans[5] = 1; rightans[6] = 1; rightans[7] = 1; rightans[8] = 1; rightans[9] = 1; //-->