Answer:
19 my person of unidentified gender (random text to make this longer)
if you have to get the answer for 4 multiplied by a number to make it 76 you know you could get the same number by dividing 76 / 4
Cant see the other shape... but make a ratio using a side that is alike to both triangles...
It’s around 45 degrees I think
I hope I helped : )