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Use the cosine rule to find the value of c. Give your answer rounded to 1 decimal place.
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dspchosenangle = question.score feedback.none Expected answer: m
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To find the value of c we need to use the cosine rule.
We need to use the angle opposite c , but this is not given so we need to work it out:
angle = 180° - 12.63° - 15.4° = 151.97°
c2=4.72+62−2×4.7×6×cos(151.97°)
Take the square root of both sides:
c=√4.72+62−2×4.7×6×cos(151.97°)=10.4 m
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