document.write( "Question 1141290: I have an isosceles triangle: On top of the triangle is a line with points A and B.The triangle is labeled with E on top, C on bottom left and D on bottom right. Under the parallel line are the numbers 1 and 2 to the top left and top right of the triangle.
\n" ); document.write( "I am so confused.
\n" ); document.write( "How to write a two column proof:
\n" ); document.write( "Given: Line AB is parallel to line CD; line EC is congruent to line ED
\n" ); document.write( "Prove: Angle 1 is congruent to angle 2. \n" ); document.write( "

Algebra.Com's Answer #761837 by math_helper(2461) $\"\"$ $\"About$

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document.write( "Small correction to MathLover1's solution:\r\n" );
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document.write( "Step 4 should read  \"ECD is congruent to angle 1,   alternate interior angles are equal\"\r\n" );
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document.write( "And similarly,  Step 5 should be  \"CDE is congruent to angle 2,   alternate interior angles are equal\"\r\n" );
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