document.write( "Question 898444: If two vertices of an equilateral triangle are (0, 4) and (0, 0), Find the third vertex. How many of these triangles are possible? \n" ); document.write( "

Algebra.Com's Answer #545202 by Fombitz(32388) $\"\"$ $\"About$

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\n" ); document.write( "There are two possible triangles.
\n" ); document.write( "

\n" ); document.write( "Since the angle at the vertex is 60 degrees, the angle that the line from (0,0) to the new vertex makes is 30 degrees.
\n" ); document.write( "The length is 4 units.
\n" ); document.write( "(x,y)=(0,0) + (4*cos(30),4*sin(30))
\n" ); document.write( "(x,y)=(3.46,2)
\n" ); document.write( "The mirror across the y-axis (for -30 degrees) is:
\n" ); document.write( "(x,y)=(-3.46,2) \n" ); document.write( "

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