<C=a
<B=2a
<A=180-3a
<D=180-2a
<BAD=<A/2=90-1.5a
<DAC=<C=a=<BAD=90-1.5a
a=90-1.5a
2,5a=90
a=36
<C=36; <B=2a=72
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<C=a
<B=2a
<A=180-3a
<D=180-2a
<BAD=<A/2=90-1.5a
<DAC=<C=a=<BAD=90-1.5a
a=90-1.5a
2,5a=90
a=36
<C=36; <B=2a=72