Find c. Round to the nearest tenth.

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asked Sep 19, 2020 232k views

1 vote

Find c. Round to the nearest tenth.

Mathematics
middle-school

Chris Hutchinson asked

by Chris Hutchinson

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1 Answer

3 votes

Answer:

$\huge\boxed{c\approx15.5ft}$

Explanation:

Use the cosine law:

$c^2=15^2+20^2-2(15)(20)\cos50^o\\\\(\cos50^o\approx0.6428)-\text{look at the picture}\\\\c^2=225+400-600(0.6428)\\\\c^2=625-385.68\\\\c^2=239.32\to c=√(239.32)\\\\c\approx15.46997\to c\approx15.5$

Bias Tegaralaga answered Sep 24, 2020

by Bias Tegaralaga

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