<PRE><B>Question 975584</B>
180° =179° 59&#39; 60&quot;
S+20° 10&#39; 30&quot;=179° 59&#39; 60&quot;
S=159° 49&#39; 30&quot;
,
,
,
900° =89° 59&#39; 60&quot;
C+20° 10&#39; 30&quot;=89° 59&#39; 60&quot;
S=69° 49&#39; 30&quot;
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