Problem

Suppose an arc of length $s$ lies on the unit circle $x^{2}+y^{2}=1$, starting at the point $(1,0)$ and terminating at the point $(x, y)$. Use a calculator to find the approximate coordinates for $(x, y)$. (Hint: $x=\cos s$ and $y=\sin s$.) \[ s=0.3 \] \[ (x, y)= \] (Type an ordered pair. Round to four decimal places as needed.)

Solution

Step 1 :Suppose an arc of length \(s\) lies on the unit circle \(x^{2}+y^{2}=1\), starting at the point \((1,0)\) and terminating at the point \((x, y)\).

Step 2 :Given that \(s=0.3\), we can use the hint given in the question that tells us that the x-coordinate of this point is \(\cos(s)\) and the y-coordinate is \(\sin(s)\).

Step 3 :Calculate \(\cos(0.3)\) and \(\sin(0.3)\) to find the coordinates of the point.

Step 4 :\(x = \cos(0.3) = 0.955336489125606\)

Step 5 :\(y = \sin(0.3) = 0.29552020666133955\)

Step 6 :Round the values of x and y to four decimal places.

Step 7 :\(x = 0.9553\)

Step 8 :\(y = 0.2955\)

Step 9 :\(\boxed{(x, y) = (0.9553, 0.2955)}\)

From Solvely APP
Source: https://solvelyapp.com/problems/19112/

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