List the angle measures of △UVW in order from smallest to largest, given that VW=73 meters, UW=59 meters, and UV=40 meters.
Question
List the angle measures of △UVW in order from smallest to largest, given that VW=73 meters, UW=59 meters, and UV=40 meters.
Solution
To solve this problem, we will use the law of cosines. The law of cosines states that for any triangle with sides of lengths a, b, and c, and an angle γ opposite side c, the following equation holds true:
c² = a² + b² - 2ab cos(γ)
We can use this law to find each angle of the triangle.
- First, let's find angle V (opposite side UV). We'll plug the given side lengths into the law of cosines:
40² = 59² + 73² - 25973*cos(V)
Solving for cos(V), we get:
cos(V) = (59² + 73² - 40²) / (25973)
Then, we find the angle V by taking the arccos of cos(V).
- Next, we'll find angle U (opposite side UW). Again, we'll use the law of cosines:
59² = 40² + 73² - 24073*cos(U)
Solving for cos(U), we get:
cos(U) = (40² + 73² - 59²) / (24073)
Then, we find the angle U by taking the arccos of cos(U).
- Finally, we'll find angle W (opposite side VW). We can find this angle by subtracting the other two angles from 180°, since the sum of the angles in a triangle is always 180°:
W = 180° - V - U
After finding the three angles, we can list them in order from smallest to largest.
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