Algebra.Com's Answer #81918 by Edwin McCravy(20060)![\"\"](\"/images/stars/stars-13.gif\")  
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Rectangle ABCD shares BC with equilateral triangle BCE. The length of CD is 4 cm, and the length of DA is 3 cm. What is the length of BE? Make a diagram if possible \r
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document.write( "Thanks I don't understand how to do this problem.\r\n" );
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document.write( "We are told that DA is 3 cm. So we put 3 on DA:\r\n" );
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document.write( "Now we know that CB and DA have the same length because\r\n" );
document.write( "they are opposite sides of a rectangle. And since DA has\r\n" );
document.write( "length 3 cm. so does CB, So we put a 3 on CB:\r\n" );
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document.write( "We are told that triangle BCE is equilateral, so all three\r\n" );
document.write( "sides of it have the same length. And since CB is a side\r\n" );
document.write( "of the equilateral triangle BCE, both CE and BE have the\r\n" );
document.write( "same length as CB. Since CB has length 3 cm, so doe BE, so\r\n" );
document.write( "we put 3 on BE and CE.\r\n" );
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document.write( "We didn't even need the fact that the length of CD is 4.\r\n" );
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document.write( "The answer is \"the length of BE is 3 cm.\"\r\n" );
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document.write( "Edwin \r
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