I need help i have 5 minutes left of class i will give brainest if answer make sure to show poof

Answer:
1 triangle
Step-by-step explanation:
1 triangle= always equals 180 degrees
45+45+90= 180 degrees
Therefore u can only make 1 triangle
Answer:
2: c
3: either A or C
4: D
Step-by-step explanation:
I don't know how to show proof, but for number 3 you could draw a 45-45-90 triangle?