Question

一个角的补角与这个角的余角的度数比为3:1,求这个角.

Answer 1

设这个角的度数为x度,则

(180°-x):(90°-x)=3:1

180°-x=270°-3x

x=45°

180°-4∠B=90°-∠A

∠A=90°-180°+4∠B

=90°-180°+4*30°

=30°