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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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'); resetdisplay(); for(var i = 0; i <10; i++) { ganswer[i] = prompt(question[i],""); if (ganswer[i] == "quit" || ganswer[i] == "QUIT" || ganswer[i] == "Quit") { break; } q++; if (ganswer[i] == answer[i]) { c++; } else { rightans[i] = 0; w++; } resetdisplay(); } for(var i = 0; i < 10; i++) { if (rightans[i] == 0) { expl = expl + explain[i]; } } parent.frames[0].document.write(expl); parent.frames[0].document.write("
"); } question[0] = 'How many points does a tangent line to a circle touch on the circle?'; question[1] = 'How many different length segements of the chord are there after drawing a perpendicular radius through the chord?'; question[2] = 'Can there be congruent arcs on a circle?'; question[3] = 'Does an inscribed angle have curved lines?'; question[4] = '3.14 is close to what non-terminating constant?'; question[5] = 'Can a triangle be inscribed in a circle?'; question[6] = 'Can an inscribed triangle be a right triangle?'; question[7] = 'Do chords have to go through the center?'; question[8] = 'If you know the length of the radius, can you find the length of the chord?'; question[9] = 'Two circles have different length radii, a chord is drawn through both, 3 units from the edge of the circle, are they the same length?'; answer[0] = '1'; answer[1] = '1'; answer[2] = 'yes'; answer[3] = 'no'; answer[4] = 'PI'; answer[5] = 'yes'; answer[6] = 'yes'; answer[7] = 'no'; answer[8] = 'no'; answer[9] = 'no'; explain[0] = '#1

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; //-->