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1.7 Trigonometry

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Question 81

In triangle ABCABCABC, side AB AB\,AB has length 5 cm, side BC BC\,BC has length 9 cm and side AC AC\,AC has length 7 cm.

a.

Find the cosine of angle ACBACBACB, giving your answer as a fraction in its simplest form.

[2]
b.

Find the exact area of the triangle.

[3]

1.7 Trigonometry Questions

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