If the supplementary angle of ∠α is 117°, what is the complementary angle of ∠α?
如果∠α的补角117°，则∠α的余角是多少．
<gadget id="calculator">180 - 117</gadget>
<output>63</output>

<gadget id="calculator">90 - 63</gadget>
<output>27</output>

<result>27</result>