document.write( "Question 251946: I really need help. i haven't done math in 13 years. I must do a proof. There are 2 triangles. one on top of the other only the top one is upside down. My given is segment AB is parallel to segment CD. those being the bases of each triangle. I must prove the top triangle APB is similar to the lower triangle DPC. the 2 triangles are sitting tip to tip not covering each other at all. face to face if u want to call it that thanks for your help \n" ); document.write( "

Algebra.Com's Answer #183688 by stanbon(75887) $\"\"$ $\"About$

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I must do a proof. There are 2 triangles. one on top of the other only the top one is upside down. My given is segment AB is parallel to segment CD. those being the bases of each triangle. I must prove the top triangle APB is similar to the lower triangle DPC. the 2 triangles are sitting tip to tip not covering each other at all. face to face if u want to call it that thanks for your help
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\n" ); document.write( "The angles at the tip are vertical angles and are equal to one another.
\n" ); document.write( "---
\n" ); document.write( "The line segment joining the parallel lines are transversals so the
\n" ); document.write( "alternate interior angles are equal.
\n" ); document.write( "---
\n" ); document.write( "Three angles of one triangle are equal to three angles in the other.
\n" ); document.write( "The triangles are similar by AAA.
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\n" ); document.write( "Hope that helps.
\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H. \n" ); document.write( "

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