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![](https://rs.olm.vn/images/avt/0.png?1311)
\(\widehat{AOI}=180^0-120^0=60^0\)
\(\widehat{KOB}=180^0-45^0=135^0\)
\(\widehat{BOA}=60^0+45^0=105^0\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\widehat{BOI}=60':4=15'\)
\(\widehat{AOI}=60'-15'=45'\)
\('\) : độ
![](https://rs.olm.vn/images/avt/0.png?1311)
vi tia AM va AN doi nhau
=>MAP va PAN la goc ke bu
=>MAP+PAN=180'.Ma PAM=33' nen ta co 33'+PAN=180'
=>PAN=180'-33'=147'
vi tia AQ nam giua 2 tia APva AN
=>PAQ+QAN=147'
=>PAN=147'-QAN=147'-58'=89'
![](https://rs.olm.vn/images/avt/0.png?1311)
ta có : xOy va yOy' la hai goc ke nhau
=) xOy = 180 do
=> yOy' + xOy = xOy'
=> yOy' = xOy' - xOy =180 - 120 = 60 do
vay yOy' = 60 do
![](https://rs.olm.vn/images/avt/0.png?1311)
b) Có: \(\widehat{xOz}+\widehat{yOz}=\widehat{yOz}+\widehat{yOt}=90^o\)
\(\Rightarrow\widehat{xOz}=\widehat{yOt}\)(cùng phụ \(\widehat{yOz}\))
c)Gọi Om là tia p/g \(\widehat{yOz}\).
Có: \(\widehat{xOz}+\widehat{zOm}=\widehat{mOy}+\widehat{yOt}\)(Vì \(\widehat{xOz}=\widehat{yOt};\widehat{zOm}=\widehat{mOy}\))
\(\Rightarrow\widehat{xOm}=\widehat{mOt}\)
\(\Rightarrow\)Om là tia p/g của \(\widehat{xOt}\).
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\widehat{BOI}=\frac{1}{4}\widehat{AOB}=>\widehat{BOI}=\frac{1}{4}\cdot60^O\)\(=>\widehat{BOI}=15^O\)
Vì tia OI nằm giữa hai tia OA và OB
\(=>\widehat{AOI}+\widehat{BOI}=\widehat{AOB}\)
Thay \(\widehat{BOI}=15^o,\widehat{AOB}=60^o\),ta có:
\(\widehat{AOI}+15^o=60^o\)
\(=>\widehat{AOI}=60^o-15^o\)
\(=>\widehat{AOI}=45^o\)
Vậy \(\widehat{BOI}=15^o;\widehat{AOI}=45^o\)
Giải
Do tia OI nằm giũa hai tia OA, OB nên![This is the rendered form of the equation. You can not edit this directly. Right click will give you the option to save the image, and in most browsers you can drag the image onto your desktop or another program.](http://latex.codecogs.com/gif.latex?%5Cwidehat%7BAOI%7D+%5Cwidehat%7B%20BOI%7D%3D%5Cwidehat%7BAOB%7D)
Suy ra
hay ![This is the rendered form of the equation. You can not edit this directly. Right click will give you the option to save the image, and in most browsers you can drag the image onto your desktop or another program.](http://latex.codecogs.com/gif.latex?%5Cwidehat%7BAOI%7D%3D15%5E%7B0%7D)
\(\widehat{BOI}\) = \(\dfrac{1}{4}\) \(\widehat{AOB}\) ⇒ \(\dfrac{1}{4}\).60o = 15o
Vì tia OI nằm giữa 2 tia OA; OB nên:
\(\widehat{AOI}\)+ \(\widehat{IOB}\)= \(\widehat{AOB}\)
⇒ \(\widehat{AOI}\)= \(\widehat{AOB} - \widehat{IOB}\) = 60o - 15o = 45o
Vậy: \(\widehat{AOI}\) = 45o