Q. In △NOP,p=760 inches, o=710 inches and ∠O=124∘. Find all possible values of ∠P, to the nearest degree.Answer:
Use Law of Sines: To find the possible values of angle P, 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 and angles. The formula is given by: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 opposite angles. In this case, we have side o (710 inches) opposite angle O (124 degrees), and side p (760 inches) opposite angle P. We can set up the equation as follows:sin(124∘)710=sin(P)760Now we need to solve for sin(P).
Calculate Sine of Angle O: First, we calculate the sine of angle O:sin(124∘)Using a calculator, we find that:sin(124∘)≈0.81915204Now we can substitute this value into our equation:0.81915204710=sin(P)760Next, we solve for sin(P).
Substitute Values: We calculate the left side of the equation:0.81915204710≈866.0254Now we have:866.0254=sin(P)760To find sin(P), we rearrange the equation:sin(P)=866.0254760Now we calculate sin(P).
Solve for Sin(P): We calculate sin(P):sin(P)≈866.0254760≈0.87719298Since the sine function can have two different angles that have the same sine value (one acute and one obtuse), we need to find the angle P that corresponds to this sine value. We use the inverse sine function to find the acute angle first.
Find Acute Angle P: Using a calculator, we find the acute angle P:P≈sin−1(0.87719298)P≈61∘However, since the sum of angles in any triangle must be 180 degrees, we need to check if there is another possible value for angle P by subtracting the acute angle from 180 degrees.
Calculate Obtuse Angle: We calculate the possible obtuse angle for P:Pobtuse=180∘−PacutePobtuse=180∘−61∘Pobtuse=119∘However, we must remember that the sum of the angles in a triangle must be 180 degrees. Since we already have two angles (124 degrees and 61 degrees), adding a third angle of 119 degrees would exceed 180 degrees. Therefore, the obtuse angle is not a possible solution for this triangle.
Check Triangle Sum: We conclude that the only possible value for angle P is the acute angle we found:P≈61∘We round this to the nearest degree as requested.
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