document.write( "Question 173426: Given: the measure of angle one equals the measure of angle 4
\n" ); document.write( "Prove: the measure of angle 2 equals the measure of angle 3\r
\n" ); document.write( "\n" ); document.write( "This book does not explain these problems so i can understand them. it has showed me how to do proofs but i still cannot understand what i am supposed to do. \n" ); document.write( "

Algebra.Com's Answer #129291 by solver91311(24713) $\"\"$ $\"About$

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Not having the diagram, there is no way to tell for certain, but I suspect that you need to demonstrate, either by use of the 5 postulates, or subsequent theorems already proven, that Angle 1 is equal in measure to either Angle 2 or Angle 3. Then show that Angle 4 is equal in measure to either Angle 3 or Angle 2. Then you can use the principle that things equal to equal things are themselves equal. If you know that a = b and c = d, then if you can demonstrate that b = c somehow, you know that a = d. \n" ); document.write( "

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