Mathematics, 07.05.2021 17:20 lulustar13

Given triangle ABC, which equation could be used to find the measure of angle B? $\cos \: m \: angle \: b = \frac{ \sqrt{5} }{5}$

$\sin \: m \: angle \: b = \frac{ \sqrt{5} }{5}$
$\cos \: m \: angle \: b = \frac{ \sqrt{5} }{2}$
$\sin \: m \: angle \: b = \frac{ \sqrt[2]{5} {} }{5}$
Given triangle ABC, which equation could be used to find the measure of angle B?

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Given triangle ABC, which equation could be used to find the measure of angle B?

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Given triangle ABC, which equation could be used to find the measure of angle B? ​

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Given triangle ABC, which equation could be used to find the measure of angle B? $\cos \: m \: angle \: b = \frac{ \sqrt{5} }{5}$