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Emaths trigo question ! Can someone help to solve Q20 in the attached file ? please explain to me how to get the answers provided, thank you ! ^^

Mathematics
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whats sin^-1(1/2)= ____radian?
arc sin(1/2)= ____radian?

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Other answers:

sin x=1/2 then x=arc sin(1/2)=___radian?
i can only get the ans 0.524 but cant get the other answer :(
ok lets try to do this like this whats 0.524 rad in degrees?
31.054° ?
its 30 degrees correct? then to find the other theta in degrees would be 180 deg - 30deg = a50 deg=___rad?
2.62 ° ! omg thank you so much ! ^^
so the diagram is actually useless right ? >< only the bottom statement is needed to solve
yup it looks like the 2.3 is an arc

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