I have no clue how to do this

1. what is the measure of ∠abc? what is the measure of ∠abd?

1) in triangle the, what is the measure of angle t (in degrees)? 2) in triangle bat, the measure of angle b is 66∘, and the measure of angle t is 77∘.what is the measure of the exterior angle at a (in degrees)?

Look at this pattern ; 1,4,9, number 10000 belongs in this pattern . what’s the place of this number?