Q. In △VWX,x=2.1cm,w=9.5cm and ∠W=110∘. Find all possible values of ∠X, to the nearest 10th of a degree.Answer:
Apply Law of Sines: To find the possible values of ∠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 ABC with sides a, b, and c opposite angles A, B, and C respectively, the following ratio holds true: (sinA)/a=(sinB)/b=(sinC)/c. We will apply this to triangle VWX.
Find Side Length: First, we need to find the length of the side opposite to angle W, which is side v. We can use the Law of Sines to find this. We have:wsin(W)=xsin(X)Substituting the given values, we get:9.5sin(110°)=2.1sin(X)
Calculate sin(X): Now we solve for sin(X): sin(X)=(sin(110°)×2.1)/9.5 Calculating the value of sin(110°) and then multiplying by 2.1 and dividing by 9.5, we get: sin(X)≈(0.9397×2.1)/9.5 sin(X)≈0.2071
Find Angle X: Next, we find the angle X by taking the inverse sine (arcsin) of sin(X):X≈arcsin(0.2071)Calculating the arcsin of 0.2071, we get:X≈11.9∘
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 X in the second quadrant. To find this, we subtract the first quadrant angle from 180°:180°−11.9°=168.1°
Check Validity: We must check if this second possible value for angle X is valid in the context of a triangle. The sum of angles in any triangle is 180∘. We already have one angle, ∠W, which is 110∘. Adding the smallest possible value for ∠X, which is 11.9∘, we get:110∘+11.9∘=121.9∘This leaves 180∘−121.9∘=58.1∘ for the third angle, which is a valid value for an angle in a triangle. Therefore, both values for ∠X are possible.