document.write( "Question 146806: Let A = (0,0), B = (4,2), C = (1,3), find the exact size of angle CAB. Justify your answer without your protractor. \n" ); document.write( "

Algebra.Com's Answer #107225 by Alan3354(69443) $\"\"$ $\"About$

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The angle from the x-axis to AC is the arctan(3), and AB is the arctan(0.5).
\n" ); document.write( "Subtracting gives 45 degrees.\r
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