Answers

2016-07-11T12:45:00+08:00
A^2 + b^2=64;
a^2=64-b^2.......1.);
by ratio and proportion;
a/b=3/5....sbs;
a^2/b^2=9/25........2.);
[64-b^2]/b^2=9/25..
1600-25b2=9b^2:
b=6.86...
cos &= 6.86/8;
&=31 degrees..
alpha= 59 degrees..

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