. ,.:.

ABCABBCDEDEDEDFABFEHABHCDE ADF BEHDEDFEHDFHE ABCA+B+C

180

1 ABC A=45B=30CCAB A+B+C=180180C= 180 -A+B = 180-45 +30 =105

1 ABCA=45B= 2CB C2 ABCA=B= 2CB C3 ABCABC=235A B C4 ABCA+ B = C C

180

Rt,ABCRtABC 30

.ABCABC C A=55, B=___ A B=21, B=___

3530

ABCABC3 ABC A B C D ABCABC=135ABC

B

3 RtCDE,CE C=55E=

4 RtABCA=2BA= B= 356030

22______ ______21BCDADC1BCD_____

ADCBACDA,B??ACD=A+B.. ACDABC ACDA

11800,2450,3 312ABCDE11200,21300,3 70

21=2 3=1001

1 ABCA=45B= 2CB C2 ABCA+ B = C C

1.?

1ABCABBCDEDE2DEDFABFEHABH3CDE ADF BEHDEDFEHDFHE4ABCA+B+C360360 12