Question 464353
<pre>
Element    Percent     Percent of 360° = Angle 
O2          45.6%          .456 × 360° = 164.16° 
Silicon     27.3           .273 × 360° =  98.28°
Alum.        8.4           .084 × 360° =  29.88°
Fe           6.2           .062 × 360° =  22.32°
Ca           4.7           .047 × 360° =  16.92°
Other        7.8           .078 × 360° =  28.08°

Draw the pizza, using a compass for the circle and a protractor
to measure the central angles.  You might also put the 
percentages in the pieces of pie even though I didn't here:

          {{{drawing(400,400,-1.5,1.5,-1.5,1.5,

        circle(0,0,1), 
line(0,0,0,1),
line(0,0,cos((90-164.16)*pi/180), sin((90-164.16)*pi/180)),
line(0,0,cos((90-262.44)*pi/180), sin((90-262.44)*pi/180)),
line(0,0,cos((90-292.32)*pi/180), sin((90-292.32)*pi/180)),
line(0,0,cos((90-314.64)*pi/180), sin((90-314.64)*pi/180)),
line(0,0,cos((90-331.56)*pi/180), sin((90-331.56)*pi/180)),
line(0,0,cos((90-359.64)*pi/180), sin((90-369.64)*pi/180)),

locate(.5,.1,O[2]), locate(-.5,-.4,Silicon),
locate(-.8,.15,Aluminum), locate(-.6,.4,Fe),
locate(-.45,.55,Ca), locate(-.3,.7,Other) 



 )}}}   

Edwin</pre>