Question

Help

Please help find b

Answer 1

It’s 70 degrees . I hope that helps if it doesn’t, send me a message

Answer 2

70°

Explanation:

1. the rule is: m(∠1)+m(∠2)+m(∠3)=180°.

2. the substitution according to the rule above:

b+2b-90+b-10=180;

4b=280;

b=70°