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In △ABC, ∠BAC=36∘, AB=AC=1. Find the length of BC.

HelpMePlssss Jun 28, 2022

Best Answer

+2668

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Make a CPhill diagram:

A

$36^ \circ$

1 1

B C

Using the Law of Cosines, we have: $BC = \sqrt{1^1 + 1^2 - 2 \times 1 \times 1 \cos(36)} \approx \color{brown}\boxed{0.61803}$

BuilderBoi Jun 28, 2022

1⁺⁰ Answers

+2668

0

Best Answer

Make a CPhill diagram:

A

$36^ \circ$

1 1

B C

Using the Law of Cosines, we have: $BC = \sqrt{1^1 + 1^2 - 2 \times 1 \times 1 \cos(36)} \approx \color{brown}\boxed{0.61803}$

BuilderBoi Jun 28, 2022

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