Question

calculate the unknown marked angles
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Answer 1

By linear pair,

<b+125°=180°

<b=55°

lly,

<c+140°=180°

<c=40°

By angle sum property

<a+<b+<c=180°

<a+55+40=180

<a+95°=180°

<a=85°

<a=85°,<b=55°,<c=40°