a) A, O, C col=> m(AOB)+ m(BOC)=180
Not m(BOC)=2x grade => m(AOB)=x grade
=>3x=180
x=60 grade=>m(AOB)=60
b)AOB is
O=60|=> AOB echi
[tex]a = \frac{ {l}^{2} \sqrt{3} }{4} = \frac{144 \sqrt{3} }{4} = 36\sqrt{3} [/tex]
c)N=mijl AO=> NB=med AOB
AOB echi|=> NB=h AOB
BNO
N=90,B=30|=>(T unghi 30) NB=12 cm
Similar MC=med DOC=>MC=6cm
DOC echi
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