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17-05-2018
Mathematics

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Find AC. Round the answer to the nearest tenth.

A.
8.2
B.
8.9
C.
10.0
D.
28.9

Please help thank you :)
Need this within 30mins

Find AC Round the answer to the nearest tenth A 82 B 89 C 100 D 289 Please help thank you Need this within 30mins class=

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Аноним Аноним

17-05-2018

Use the Cosine Rule:-

AC^2 = 6^2 + 8^2 - 2*6*8 cos 78
= 80.04

So AC = sqrt 80.04 = 8.9 to nearest tenth

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