In ΔABC, c = 40 inches, a = 85 inches and ∠B=29°. Find ∠C, to the nearest degree.
Question
In ΔABC, given the following values:
- c = 40 inches
- a = 85 inches
- ∠B = 29°
Find ∠C, to the nearest degree.
Solution
To find ∠C in ΔABC, 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 angle opposite that side is the same for all three sides of the triangle.
The formula for the Law of Sines is:
a/sinA = b/sinB = c/sinC
We know the values of a, c, and ∠B, so we can substitute those into the formula:
85/sinC = 40/sin29°
To solve for sinC, we rearrange the equation:
sinC = 85*sin29°/40
Calculate the value of sinC using a calculator.
Then, to find ∠C, take the inverse sine (sin^-1) of the value you found for sinC.
Round your answer to the nearest degree.
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