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In 
/_\VWX,x=2.1cm,w=9.5cm and 
/_W=110^(@). Find all possible values of 
/_X, to the nearest 1oth of a degree.
Answer:

In VWX,x=2.1 cm,w=9.5 cm \triangle \mathrm{VWX}, x=2.1 \mathrm{~cm}, w=9.5 \mathrm{~cm} and W=110 \angle \mathrm{W}=110^{\circ} . Find all possible values of X \angle \mathrm{X} , to the nearest 1010th of a degree.\newlineAnswer:

Full solution

Q. In VWX,x=2.1 cm,w=9.5 cm \triangle \mathrm{VWX}, x=2.1 \mathrm{~cm}, w=9.5 \mathrm{~cm} and W=110 \angle \mathrm{W}=110^{\circ} . Find all possible values of X \angle \mathrm{X} , to the nearest 1010th of a degree.\newlineAnswer:
  1. Apply Law of Sines: To find the possible values of X\angle X, we can use the Law of Sines, which relates the sides of a triangle to the sines of its 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 ratio holds true: (sinA)/a=(sinB)/b=(sinC)/c(\sin A)/a = (\sin B)/b = (\sin C)/c. We will apply this to triangle VWXVWX.
  2. Find Side Length: First, we need to find the length of the side opposite to angle WW, which is side vv. We can use the Law of Sines to find this. We have:\newlinesin(W)w=sin(X)x\frac{\sin(W)}{w} = \frac{\sin(X)}{x}\newlineSubstituting the given values, we get:\newlinesin(110°)9.5=sin(X)2.1\frac{\sin(110°)}{9.5} = \frac{\sin(X)}{2.1}
  3. Calculate sin(X)\sin(X): Now we solve for sin(X)\sin(X):
    sin(X)=(sin(110°)×2.1)/9.5\sin(X) = (\sin(110°) \times 2.1) / 9.5
    Calculating the value of sin(110°)\sin(110°) and then multiplying by 2.12.1 and dividing by 9.59.5, we get:
    sin(X)(0.9397×2.1)/9.5\sin(X) \approx (0.9397 \times 2.1) / 9.5
    sin(X)0.2071\sin(X) \approx 0.2071
  4. Find Angle X: Next, we find the angle XX by taking the inverse sine (arcsin) of sin(X)\sin(X):\newlineXarcsin(0.2071)X \approx \arcsin(0.2071)\newlineCalculating the arcsin of 0.20710.2071, we get:\newlineX11.9X \approx 11.9^\circ
  5. Find Second X Value: However, since the sine function is positive in both the first and second quadrants, there is another possible value for angle XX in the second quadrant. To find this, we subtract the first quadrant angle from 180°180°:180°11.9°=168.1°180° - 11.9° = 168.1°
  6. Check Validity: We must check if this second possible value for angle XX is valid in the context of a triangle. The sum of angles in any triangle is 180180^\circ. We already have one angle, W\angle W, which is 110110^\circ. Adding the smallest possible value for X\angle X, which is 11.911.9^\circ, we get:\newline110+11.9=121.9110^\circ + 11.9^\circ = 121.9^\circ\newlineThis leaves 180121.9=58.1180^\circ - 121.9^\circ = 58.1^\circ for the third angle, which is a valid value for an angle in a triangle. Therefore, both values for X\angle X are possible.

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