PowerPoint Presentation

,

-

?4

-

, , , d = ABC+ ADC=ABC +ABC=2xABC=2x1/2xaxb=axbBCDAabDBCaa ABCD = ABC + ADC = ABC + ABC = 2x ABC =2x1/2xaxa =axa =xADCAEBhb ABCD = ABD + BDC = ABD + ABD =2x ABD =2x1/2xbxh =bxh =x ABCDOd1d ABCD = ABC+ ADC = ABC+ ABC =2x ABC =2x1/2xd1xd/2 =1/2xd1xd =1/2x

? ? ?

?