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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("
"); } window.open("../../../media/geo_tran.gif", target="new"); question[0] = 'Do parallel lines intersect?'; question[1] = 'Is it possible to tell if lines are parallel by using a Transversal?'; question[2] = 'How many angles are formed by a transversal through parallel lines?'; question[3] = 'Using the image as a reference, if angle 1 = angle 5, are the lines parallel?'; question[4] = 'Using the image as a reference, if angle 1 = angle 6 and is not equal to 90 degrees, are the lines parallel?'; question[5] = 'Are parallel lines useful in helping to find angle measures in Triangles?'; question[6] = 'Using the image as a reference, if angle 1 = angle 2, what is the angle measure?'; question[7] = 'Using the image as a reference, given that the lines are parallel, how many different angle measures are there?'; question[8] = 'Using the image as a reference, given that the lines are not parallel, how many different angle measures are there at most?'; question[9] = 'Using the image as a reference, given that angle 1 = 120 degrees, and angle 5 = 60 degrees, are the lines parallel?'; answer[0] = 'no'; answer[1] = 'yes'; answer[2] = '8'; answer[3] = 'yes'; answer[4] = 'no'; answer[5] = 'yes'; answer[6] = '90'; answer[7] = '2'; answer[8] = '4'; answer[9] = 'no'; explain[0] = '#1

Parallel lines do not intersect.

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Using transversals you can tell if lines are paralle, by the angle measures.

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There are 8 total angles formed by a transveral through any two lines. 4 on each line.

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The two angles are in the same position on different lines. If the lines are parallel they should be equal, if not, they won't be.

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The angles do not match up in position, nor are they across from the others match. They are next to the others match. The 2 angles must add up to equal 180 degrees, if they are not equal to 90 degrees then they can not be equal and still be equal to their matches on the other line. So the lines are not parallel.

'; explain[5] = '#6

Parallel lines can help you line up specific angles on triangles, and using principles from parallel lines, and from triangles, it can help you to find the other angles on a triangle.

'; explain[6] = '#7

If angle 1 equals angle 2, since they are supposed to add up to 180 degrees, if they are equal that would mean that they must equal 90 degrees.

'; explain[7] = '#8

If the lines are parallel, then the angles across from each other are equal, and their matching positions on the other line are also equal. So there are only 2 different angle measures.

'; explain[8] = '#9

The angles across from each other are always equal, if the lines are not parallel, their matching positions will not be equal, so there will be 4 different angle measures.

'; explain[9] = '#10

If angle 1 is 120 degrees, then then angle 5 should also be 120 degrees if the lines are parallel, since it is not, the lines are not parallel.

'; 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; //-->