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The Cosine Rule

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Question 12

A metal support frame is triangular with side lengths 7 cm, 10 cm, and 12 cm. The angle between the 7 cm and 10 cm sides is labeled θ∘\theta^\circθ∘.

Work out the value of θ\thetaθ.

Give your answer to 1 decimal place.

[3]

The Cosine Rule Questions

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