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In 
/_\DEF,e=840 inches, 
d=760 inches and 
/_D=134^(@). Find all possible values of 
/_E, to the nearest degree.
Answer:

In DEF,e=840 \triangle \mathrm{DEF}, e=840 inches, d=760 d=760 inches and D=134 \angle \mathrm{D}=134^{\circ} . Find all possible values of E \angle \mathrm{E} , to the nearest degree.\newlineAnswer:

Full solution

Q. In DEF,e=840 \triangle \mathrm{DEF}, e=840 inches, d=760 d=760 inches and D=134 \angle \mathrm{D}=134^{\circ} . Find all possible values of E \angle \mathrm{E} , to the nearest degree.\newlineAnswer:
  1. Apply Law of Sines: To find the possible values of /_E, 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 three sides of the triangle. The formula is:\newlineasin(A)=bsin(B)=csin(C) \frac{a}{\sin(A)} = \frac{b}{\sin(B)} = \frac{c}{\sin(C)} \newlinewhere a, b, and c are the lengths of the sides, and A, B, and C are the opposite angles. In this case, we have side e and angle D, so we can set up the ratio for side e and angle E.
  2. Find Sine of Angle D: First, we need to find the sine of angle D. Since /_D is 134134 degrees, we can calculate:\newlinesin(D)=sin(134) \sin(D) = \sin(134^\circ) \newlineUsing a calculator, we find that:\newlinesin(134)0.656059 \sin(134^\circ) \approx 0.656059
  3. Set Up Ratio for Side e: Now, we can set up the Law of Sines ratio for side e and angle E:\newlineesin(E)=dsin(D) \frac{e}{\sin(E)} = \frac{d}{\sin(D)} \newlineSubstituting the known values, we get:\newline840sin(E)=7600.656059 \frac{840}{\sin(E)} = \frac{760}{0.656059}
  4. Solve for Sin(E): Solving for sin(E), we have:\newlinesin(E)=8407600.656059 \sin(E) = \frac{840}{\frac{760}{0.656059}} \newlinesin(E)=840×0.656059760 \sin(E) = \frac{840 \times 0.656059}{760} \newlinesin(E)551.08956760 \sin(E) \approx \frac{551.08956}{760} \newlinesin(E)0.725118 \sin(E) \approx 0.725118
  5. Calculate Angle E: To find angle E, we take the inverse sine (arcsin) of 00.725118725118:\newlineE=arcsin(0.725118) E = \arcsin(0.725118) \newlineUsing a calculator, we find that:\newlineE46.57 E \approx 46.57^\circ \newlineSince we need to round to the nearest degree, /_E is approximately 4747 degrees.
  6. Calculate Angle E: To find angle E, we take the inverse sine (arcsin) of 00.725118725118:\newlineE=arcsin(0.725118) E = \arcsin(0.725118) \newlineUsing a calculator, we find that:\newlineE46.57 E \approx 46.57^\circ \newlineSince we need to round to the nearest degree, /_E is approximately 4747 degrees.However, we must consider that there could be another possible value for angle E because the sine function is positive in both the first and second quadrants. Since the sum of angles in a triangle must be 180180 degrees, we can find the other possible value for angle E by subtracting angle D and our found angle E from 180180 degrees:\newline18013447=1 180^\circ - 134^\circ - 47^\circ = -1^\circ \newlineThis result is not possible because angles in a triangle cannot be negative. Therefore, there is only one possible value for angle E.

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