Question

What is the value of y?

Answer 1

Y= 54 degrees


explaination: triangle angles = 180 degrees
So
180-72(the angle you already have)
108 then divide by 2 because that is how many more angles you have and you get 54.

Answer 2

what is the bottom one

you can do

72+y + the bottom= 180

(sum of all angles of triangle is 180)