Question

in triangle ABC , A = 80° , AB = BC , then B° ?
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Answer 1

Step-by-step explanation:

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Answer 2

QUESTION:- in triangle ABC , A = 80° , AB = BC , then B° ?

ANSWER:- A° = 80°

AB= BC

SO , it's a iscoceles triangle .

then B° = C° , let these be x .

so,

$80 + x + x = 180 \ \\ \\ \ 2x + 80 = 180 \\ \\ \ 2x = 180 - 80 \\ \\ 2x = 100 \\ \\ x = \frac{100}{2} \\ \\ x = 50 \\ \\ so \: \ \: \: b \: \: = 50$

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