Question

In triangle ABC angle B=105,angleC=50.find angleA

Answer 1

angle A=25...............

Answer 2

$\huge\bold{question : }$

➡ In triangle ABC angle B=105,angleC=50.find angleA

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$\huge\bold {answer : }$

in ∆ ABC ,

$\angle \: b \: = \: 105\degree$

$\angle \: c \: = \: 50\degree$

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➡ in any triangle

sum of measures of all angles of a triangle is 180°

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so ,

$\angle \: b \: + \: \angle \: a \: + \: \angle \: c \: = \: 180\degree$

$\angle \: a \: + \: 105\degree \: + \: 50\degree \: = 180\degree \\ \\ \angle \: a \: = \: 180\degree - 105\degree - 50\degree \\ \\ \angle \: a \: = \: 25 \degree$

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