1A13.5 cm 8.3 cmCB32°The diagram shows triangle ABC, with .AC 13 5cm= , .BC 8 3cm= and angle ABC 32°= .Find angle CAB
Question
1A
The diagram shows triangle ABC, with
- AC = 13.5 cm,
- BC = 8.3 cm
- angle ABC = 32°
Find angle CAB.
Solution
To find angle CAB in triangle ABC, we can use the Law of Sines. The Law of Sines 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.
Here's how you can apply it:
-
First, let's denote angle CAB as α. We know that BC = 8.3 cm, AC = 13.5 cm, and angle ABC = 32°.
-
According to the Law of Sines, we have sin(ABC)/BC = sin(CAB)/AC.
-
Substituting the known values, we get sin(32°)/8.3 = sin(α)/13.5.
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Solving for sin(α), we get sin(α) = (sin(32°) * 13.5) / 8.3.
-
To find α, we take the inverse sine (sin^-1) of the result from step 4.
-
Therefore, α = sin^-1[(sin(32°) * 13.5) / 8.3].
-
Use a calculator to compute this value. Make sure your calculator is set to degrees, not radians.
This will give you the measure of angle CAB in degrees.
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