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8) ∆ABC
m( ^A)= 90°
sim^ABC =1\2
_____________
Cos^ABC=?​

8 ABC M A 90 SimABC 12CosABC class=

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PutereDinuask

[tex]m(\angle A)=90^o \\ \sin(\angle ABC)=\frac{1}{2} \\ \Rightarrow \angle B=30^o \\ \Rightarrow \angle C=60^o \\ \Rightarrow\boxed{ \cos(\angle ABC )=\frac{\sqrt3}{2}}[/tex]

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