Respuesta :

I am pretty sure that the answer is 80. If I am correct all the angles on a triangle should add up to 180. You have 45+55 which equals 100 and then you have the unknown angle. The only choice that fits your answer is 80.
kafleshristi2005

Answer:

80°

Step-by-step explanation:

let make suppose angle x°

x°+45°+55°= 180 { the sum of angle of triangle is 180°}

or, x° + 100° = 180°

or, x° = 180° - 100°

or, x° = 80°

x°= 80°

good job