如图所示A0A1A2A3A4A5是一条折线,A0A1=1,A1A2=2,A2A3=3,A3A4=4,A4A5=5;且∠A0A1A2=∠A1A2A3=∠A2A3A4=∠A3A4A5=60°.
求证: A0A5⊥A3A4.
如图所示A0A1A2A3A4A5是一条折线,A0A1=1,A1A2=2,A2A3=3,A3A4=4,A4A5=5;且∠A0A1A2=∠A1A2A3=∠A2A3A4=∠A3A4A5=60°.
求证: A0A5⊥A3A4.
连接A0A2
因为∠A1=60,且A0A1=1,A1A2=2
所以三角形A0A1A2为直角三角形且∠A0A2A1=30.
延长A2A0交A3A4于B
因为∠A0A2A1=30.
所以∠A3A2A0=30
又因为A2A3=3
30度所对的直角边=斜边的一半
A3B=1.5
A4B=2.5
因为A5A4=5
且30度所对的直角边=斜边的一半
所以A0A1的延长线交A5
所以A0A5⊥A3A4