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In 
/_\WXY,y=1.3 inches, 
x=1.1 inches and 
/_X=51^(@). Find all possible values of 
/_Y, to the nearest 10th of a degree.
Answer:

In WXY,y=1.3 \triangle \mathrm{WXY}, y=1.3 inches, x=1.1 x=1.1 inches and X=51 \angle \mathrm{X}=51^{\circ} . Find all possible values of Y \angle \mathrm{Y} , to the nearest 1010th of a degree.\newlineAnswer:

Full solution

Q. In WXY,y=1.3 \triangle \mathrm{WXY}, y=1.3 inches, x=1.1 x=1.1 inches and X=51 \angle \mathrm{X}=51^{\circ} . Find all possible values of Y \angle \mathrm{Y} , to the nearest 1010th of a degree.\newlineAnswer:
  1. Apply Law of Sines: To find the possible values of Y\angle Y, we can use the Law of Sines, which relates the ratios of the lengths of sides of a triangle to the sines of the opposite angles. The Law of Sines states that for any triangle ABCABC with sides aa, bb, and cc opposite angles AA, BB, and CC respectively, the following is true:\newlinesin(A)a=sin(B)b=sin(C)c\frac{\sin(A)}{a} = \frac{\sin(B)}{b} = \frac{\sin(C)}{c}\newlineIn our case, we have triangle WXYWXY with sides ABCABC00, ABCABC11, and ABCABC22 opposite angles ABCABC33, ABCABC44, and ABCABC55 respectively. We are given that side ABCABC66 inches, side ABCABC77 inches, and angle ABCABC88 degrees. We want to find angle ABCABC55.\newlineFirst, we will find the ratio for angle ABCABC44 and side ABCABC11 using the Law of Sines.
  2. Calculate Ratio for Angle X: We calculate the sine of angle X: sin(X)=sin(51)\sin(X) = \sin(51^\circ) Using a calculator, we find that: sin(51)0.7771\sin(51^\circ) \approx 0.7771 (rounded to four decimal places) Now we can set up the ratio for angle X and side xx: (sin(X)/x)=(0.7771/1.1)(\sin(X)/x) = (0.7771/1.1)
  3. Set Up Equation for Angle Y: Next, we calculate the ratio:\newline(0.7771/1.1)0.7065(0.7771/1.1) \approx 0.7065 (rounded to four decimal places)\newlineThis ratio should be equal to the ratio of (sin(Y)/y)(\sin(Y)/y) according to the Law of Sines.
  4. Calculate Sin(Y): Now we set up the equation for angle YY and side yy using the Law of Sines:\newline(sin(Y)y)=0.7065(\frac{\sin(Y)}{y}) = 0.7065\newline(sin(Y)1.3)=0.7065(\frac{\sin(Y)}{1.3}) = 0.7065\newlineTo find sin(Y)\sin(Y), we multiply both sides by yy (1.31.3 inches):\newlinesin(Y)=0.7065×1.3\sin(Y) = 0.7065 \times 1.3
  5. Find Acute Angle Y: We calculate the value of sin(Y)\sin(Y):sin(Y)=0.7065×1.30.91845\sin(Y) = 0.7065 \times 1.3 \approx 0.91845 (rounded to five decimal places) However, we must be cautious here because the sine function can have two different angles that have the same sine value, one acute (less than 9090 degrees) and one obtuse (between 9090 and 180180 degrees), within the range of 00 to 180180 degrees which are the possible values for an angle in a triangle.
  6. Find Obtuse Angle Y: First, we find the acute angle YY that corresponds to the sine value we calculated: Y=arcsin(0.91845)Y = \arcsin(0.91845) Using a calculator, we find that: Y66.4Y \approx 66.4 degrees (rounded to the nearest 1010th of a degree) This is the acute angle solution for angle YY.
  7. Check Validity of Acute Angle: To find the obtuse angle solution, we use the fact that sin(180Y)=sin(Y)\sin(180^\circ - Y) = \sin(Y). Therefore, the obtuse angle solution for YY is:\newlineYobtuse=180YacuteY_{\text{obtuse}} = 180^\circ - Y_{\text{acute}}\newlineYobtuse=18066.4Y_{\text{obtuse}} = 180^\circ - 66.4^\circ\newlineYobtuse113.6Y_{\text{obtuse}} \approx 113.6^\circ (rounded to the nearest 1010th of a degree)
  8. Check Validity of Obtuse Angle: We must now check if the obtuse angle solution is valid for a triangle. The sum of the angles in any triangle is 180180 degrees. We already have one angle, XX, which is 5151 degrees. Adding the acute angle solution for YY, we have:\newline5151 degrees ++ 66.466.4 degrees == 117.4117.4 degrees\newlineThis leaves us with:\newline180180 degrees XX00 117.4117.4 degrees == XX33 degrees for angle XX44\newlineSince this is a valid angle measurement, the acute angle solution for YY is valid.
  9. Check Validity of Obtuse Angle: We must now check if the obtuse angle solution is valid for a triangle. The sum of the angles in any triangle is 180180 degrees. We already have one angle, XX, which is 5151 degrees. Adding the acute angle solution for YY, we have:\newline5151 degrees ++ 66.466.4 degrees == 117.4117.4 degrees\newlineThis leaves us with:\newline180180 degrees XX00 117.4117.4 degrees == XX33 degrees for angle XX44\newlineSince this is a valid angle measurement, the acute angle solution for YY is valid.Now we check the obtuse angle solution. Adding the obtuse angle solution for YY to angle XX, we have:\newline5151 degrees ++ 515100 degrees == 515122 degrees\newlineThis leaves us with:\newline180180 degrees XX00 515122 degrees == 515177 degrees for angle XX44\newlineSince this is also a valid angle measurement, the obtuse angle solution for YY is also valid.

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