f1-f2全等及相似功課

angleADB=angleABC(Given)

angleA=angleA

angleC+angleABC+angleA=180(sum of triangle)
angleC.............................=180-angleC-angleABC

angleDBA+angleADB+angleA=180(sum of triangle)
angleDBA.............................=180-angleA-angleADB

ADB=ABC(Proved)
angleDBA=angleC


^ABC~^BDA(AAA)

2010-08-18 22:08:24 補充：
Find something that you can prove............

2010-08-18 22:16:20 補充：
which is about geometry

2010-08-19 18:50:31 補充：
angle=角

Prove證明,PROVED己證

sum of triangle3角形內角和(即180度)

只有一幅圖，你要我們證明甚麼？