If in any triangle all angle sum is 180 then why in trigonometry we assume A+B+C=90

here A,B,C should mean half of the angles of a triangle.

plz say yes if  u like my reply.thank u advance

Dear,

We never assume in trigo

A+B+C=90

we always assume

A+B+C=180

.best of luck

If u lyk my answer plz approve it by clicking yes