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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. 8.2 B. 8.9 C. 10.0 D. 28.9 Please help thank you :) Need this within 30mins
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2 votes
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. 8.2 B. 8.9 C. 10.0 D. 28.9 Please-example-1
User Dency G B
by
7.4k points

1 Answer

3 votes
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
User Daniel Cerecedo
by
8.2k points
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