Find Arc Length

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Find Arc Length

Trigonometry
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hi, i need helping with both parts of this question! i know that delta = s / r (in radians), but i can't seem to understand how to find the angle
i'm also going to assume r = 7.5

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Other answers:

there is one information just r.
yes, the only known variable is 'r'. but it seems that there's a way to find the numerical value of theta
theta is approximately 60 degree
you can make an estimate of the angle theta the slope is about 6.6 so find the angle whose tangent is 6.6
that is 81 degrees to the nearest degree
  • phi
yes, I get height 8.4 and 1.33 to the right so 90 - arctan(1.33/8.4) = 81
from this you can find the arc length s
using radius of 7.5
thank you! i'll try to find s
@phi i think its 80 cuz i use long method
yeah, it's 80!
|dw:1440889274064:dw| @phi check my frw
i figured out s, it's 10.5 (1.396rad * 7.5). thank you all for your help! :)
yw
@dinamix what do you mean by the long method?

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