document.write( "Question 1096708: . Show that A(-4, 2), B(1, 4), C(3, -1) and D(-2, -3) are vertices of a square \n" ); document.write( "

Algebra.Com's Answer #711192 by Edwin McCravy(20055) $\"\"$ $\"About$

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document.write( "Show that the four red triangles around the smaller \r\n" );
document.write( "purplish-blue square in the middle are all congruent \r\n" );
document.write( "right triangles by side-angle-side.  Then CPCT shows\r\n" );
document.write( "that the four red hypotenuses are congruent.  Then use the\r\n" );
document.write( "fact that the two acute angles of a right triangle are \r\n" );
document.write( "complementary to show that four interior angles of the\r\n" );
document.write( "larger square-to-be-proved are right angles.\r\n" );
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document.write( "Edwin

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