30 !
what is the value of b?
55
90
100
110

b° = 100

Step-by-step explanation:

A triangle always adds up to 180° in its interior angles;

To calculate the angle missing in the triangle with 55° and 45°

; 180° - (55° + 45°)

; 180° - 100°

; The angle is 80°

Then for us to calculate the angle at b°

A straight line makes an angle of 180°

;Hence the angle b°

;180° - 80°

Therefore b° = 100°

The answer is 100

Step-by-step explanation: