Q. In △WXY,x=450 inches, w=220 inches and ∠W=157∘. Find all possible values of ∠X, to the nearest 10th of a degree.Answer:
Apply Law of Sines: To find the possible values of angle X, we can use the Law of Sines, which relates the sides of a triangle to its angles. The Law of Sines states that the ratio of the length of a side to the sine of its opposite angle is constant for all sides and angles in a triangle. The formula is:sin(A)a=sin(B)b=sin(C)cwhere a,b, and c are the lengths of the sides, and A,B, and C are the measures of the opposite angles.
Find Angle Y: First, we need to find the measure of angle Y using the fact that the sum of angles in a triangle is 180 degrees. We have:∠W+∠X+∠Y=180∘Given that ∠W=157∘, we can write:157∘+∠X+∠Y=180∘
Express Angle X: To find ∠Y, we need to express ∠X in terms of ∠Y or vice versa. Since we don't have any information about ∠X yet, we can express it as:∠X=180∘−157∘−∠Y∠X=23∘−∠Y
Use Law of Sines: Now we can use the Law of Sines to relate the sides and angles. We have:sin(∠X)x=sin(∠W)wSubstituting the given values, we get:sin(∠X)450=sin(157∘)220
Calculate Sin X: We can now solve for sin(∠X) by cross-multiplying and then use the inverse sine function to find ∠X. However, we must be careful because the inverse sine function can give us an angle less than 90 degrees, but since ∠X is supplementary to ∠Y, we need to consider that ∠X could be obtuse (greater than 90 degrees). Let's first calculate sin(∠X):sin(∠X)=220450⋅sin(157∘)
Calculate Sin X: We can now solve for sin(∠X) by cross-multiplying and then use the inverse sine function to find ∠X. However, we must be careful because the inverse sine function can give us an angle less than 90 degrees, but since ∠X is supplementary to ∠Y, we need to consider that ∠X could be obtuse (greater than 90 degrees). Let's first calculate sin(∠X):sin(∠X)=220450⋅sin(157∘)Using a calculator to find sin(157∘) and then calculating sin(∠X):sin(157∘)≈0.999048sin(∠X)≈220450⋅0.999048sin(∠X)≈2.041This value is greater than 1, which is not possible for a sine value. This indicates that there has been a math error in the calculation.
More problems from Find trigonometric functions using a calculator