ขนาดวิดีโอ: 1280 X 720853 X 480640 X 360
แสดงแผงควบคุมโปรแกรมเล่น
เล่นอัตโนมัติ
เล่นใหม่
I migh be wrong but Labeling the sides make it easier to follow up than using vertex as segment.AB = x. AC = y that way it will not be busy during calculation. Plus it is easy for followers to remember the sides without reading the vertex
For me sine law or ratio of areas of this two triangles is quite easy proof
By BPTAB/AE = BD/DCas AE = ACie, AB/AC = BD/DC
△ABD:△ACD=(1/2)AB・ADsinθ:(1/2)AC・ADsinθ=AB:AC △ABD:△ACD=BD:CD ∴AB:AC=BD:CD
Sir , don't give sub titles . It is causing obstruction . We can't see what you are writing . Regards.
You can open and close subtitles
How to open and close sub titles
Click on the CC option beside the settings option in the video
Thank you Sir
I migh be wrong but Labeling the sides make it easier to follow up than using vertex as segment.
AB = x. AC = y that way it will not be busy during calculation. Plus it is easy for followers to remember the sides without reading the vertex
For me sine law or ratio of areas of this two triangles is quite easy proof
By BPT
AB/AE = BD/DC
as AE = AC
ie, AB/AC = BD/DC
△ABD:△ACD=(1/2)AB・ADsinθ:(1/2)AC・ADsinθ=AB:AC
△ABD:△ACD=BD:CD
∴AB:AC=BD:CD
Sir , don't give sub titles . It is causing obstruction . We can't see what you are writing . Regards.
You can open and close subtitles
How to open and close sub titles
Click on the CC option beside the settings option in the video
Thank you Sir