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Mathematics 21 Online
OpenStudy (knightrider):

how to find angle b/w two vertex in a circle????

OpenStudy (anonymous):

u have picture?

OpenStudy (knightrider):

wait

OpenStudy (anonymous):

what do u mean by vertex in a circle?

OpenStudy (anonymous):

yeah..a picture might help

OpenStudy (anonymous):

?

OpenStudy (knightrider):

i'm trying to find a picture pls w8 for couple of more mis

OpenStudy (anonymous):

I be back, the angles depen

OpenStudy (knightrider):

here is the pic

OpenStudy (knightrider):

angle b/w A and B

OpenStudy (anonymous):

what w?

OpenStudy (anonymous):

between A and B?

OpenStudy (knightrider):

yeah

OpenStudy (anonymous):

A and B are the points on a circle, u can find the central angle of the arecAB

OpenStudy (anonymous):

arc AB*

OpenStudy (anonymous):

just 90 degrees lol

OpenStudy (anonymous):

why make it complicated

OpenStudy (anonymous):

well, the figure is drawn roughly, may not b perpendicular

OpenStudy (knightrider):

how to find the central angle

OpenStudy (anonymous):

>>

OpenStudy (anonymous):

u need more info, the radius and the length of arc

OpenStudy (anonymous):

\[r=l \theta\]

OpenStudy (anonymous):

\[l=r \theta\]

OpenStudy (anonymous):

arc length=radius * central angle

OpenStudy (anonymous):

A B is 90 degree then the central angle is the same

OpenStudy (anonymous):

yeh, thats prob it , im not paying much attention tonight

OpenStudy (anonymous):

the angle on the circle is 1/2 angles in center

OpenStudy (knightrider):

radius is 50 mm and length is 78.5 mm but i'm getting 1.57 deg

OpenStudy (anonymous):

the answer you get is in radians

OpenStudy (anonymous):

78.5/50

OpenStudy (anonymous):

if you are using l =r theta

OpenStudy (anonymous):

pi radians = 180 degrees , therefore 1 radian = 180 / pi degrees

OpenStudy (anonymous):

which works out as 90degrees exactly

OpenStudy (anonymous):

so I was right from the start :P

OpenStudy (anonymous):

how come?

OpenStudy (anonymous):

what do u mean how come, I was right

OpenStudy (anonymous):

right if the lines are perpendicular,

OpenStudy (anonymous):

well, it turns out they are :P

OpenStudy (anonymous):

yes, the seem to be :)

OpenStudy (anonymous):

but actually the qs is to find the angle b/w A n B

OpenStudy (anonymous):

your point?

OpenStudy (anonymous):

angle is 90 , done

OpenStudy (anonymous):

angle is 90 , done

OpenStudy (anonymous):

conditiionally done ;)

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