<1=х;<2=2х;<3=4х;<4=2х;<1+<2+<3+<4=360;х+2х+4х+2х=360;9х=360;х=360÷9;х=40;<3=4х=4*40=160°–ответ.
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<1=х;<2=2х;<3=4х;<4=2х;<1+<2+<3+<4=360;х+2х+4х+2х=360;9х=360;х=360÷9;х=40;<3=4х=4*40=160°–ответ.