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In 
/_\FGH,g=170cm,f=960cm and 
/_F=19^(@). Find all possible values of 
/_G, to the nearest 1oth of a degree.
Answer:

In FGH,g=170 cm,f=960 cm \triangle \mathrm{FGH}, g=170 \mathrm{~cm}, f=960 \mathrm{~cm} and F=19 \angle \mathrm{F}=19^{\circ} . Find all possible values of G \angle \mathrm{G} , to the nearest 1010th of a degree.\newlineAnswer:

Full solution

Q. In FGH,g=170 cm,f=960 cm \triangle \mathrm{FGH}, g=170 \mathrm{~cm}, f=960 \mathrm{~cm} and F=19 \angle \mathrm{F}=19^{\circ} . Find all possible values of G \angle \mathrm{G} , to the nearest 1010th of a degree.\newlineAnswer:
  1. Apply Law of Sines: To find the possible values of /_G, we can use the Law of Sines, which states that the ratio of the length of a side of a triangle to the sine of the opposite angle is the same for all sides and angles in the triangle. The formula is:\newlineasin(A)=bsin(B)=csin(C) \frac{a}{\sin(A)} = \frac{b}{\sin(B)} = \frac{c}{\sin(C)} \newlineHere, we have side g opposite /_G, side f opposite /_F, and we are given the values of g, f, and /_F.
  2. Write Formula with Given Values: First, let's write the Law of Sines formula using the given values:\newlinefsin(F)=gsin(G) \frac{f}{\sin(F)} = \frac{g}{\sin(G)} \newline960sin(19°)=170sin(G) \frac{960}{\sin(19°)} = \frac{170}{\sin(G)}
  3. Solve for sin(G): Now, we solve for sin(G)\sin(G):\newlinesin(G)=170sin(19°)960 \sin(G) = \frac{170 \cdot \sin(19°)}{960}
  4. Calculate sin(G) Value: We calculate the value of sin(G)\sin(G) using a calculator:\newlinesin(G)1700.32557960 \sin(G) ≈ \frac{170 \cdot 0.32557}{960} \newlinesin(G)55.3469960 \sin(G) ≈ \frac{55.3469}{960} \newlinesin(G)0.05765 \sin(G) ≈ 0.05765
  5. Find Angle G: Next, we find the angle G by taking the inverse sine (arcsin) of sin(G)\sin(G):\newlineGarcsin(0.05765) G ≈ \arcsin(0.05765)
  6. Check Validity of Second Value: Using a calculator, we find:\newlineG3.3° G ≈ 3.3° \newlineHowever, since the sine function is positive in both the first and second quadrants, there could be another possible value for angle G in the second quadrant. This value would be:\newlineG=180°G G' = 180° - G \newlineG=180°3.3° G' = 180° - 3.3° \newlineG176.7° G' ≈ 176.7°
  7. Check Validity of Second Value: Using a calculator, we find:\newlineG3.3° G ≈ 3.3° \newlineHowever, since the sine function is positive in both the first and second quadrants, there could be another possible value for angle G in the second quadrant. This value would be:\newlineG=180°G G' = 180° - G \newlineG=180°3.3° G' = 180° - 3.3° \newlineG176.7° G' ≈ 176.7° We must check if the second possible value for angle G is valid by ensuring the sum of the angles in the triangle does not exceed 180180°. Since we already have /_F = 1919°, we add this to our two possible values for /_G:\newline19°+3.3°+G180° 19° + 3.3° + G'' \leq 180° \newline19°+176.7°+G180° 19° + 176.7° + G'' \leq 180° \newlineThe first equation is valid for any angle G'', but the second equation is not possible because 1919° + 176176.77° already exceeds 180180°. Therefore, the only possible value for /_G is 33.33°.

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