I need help pleaseee

ok this triangle is an isosceles triangle because when you tell sit and look at the base sides that is 55° and be those are the base angles so if one is 55 the other one is also 55 So B is 55

B=55°

Step-by-step explanation:

That is an isosceles triangle TS and US are the same size. So the 2 angles at the base (TU) will be the same. so b=55°

m∠5 + m∠3 = m∠1   is true.

m∠5 + m∠6 = 180 is true

m∠2 +m∠3 = m∠6   is true

m∠2 +m∠3 +m∠5 = 180   is true

3 3 6, because in every triangle the longer side is always shorter than the sum of the other two