4. According to the given data we have the following:
The angles ∠1 and ∠2 are complementary, or adjacent angles that form a right angle.
Therefore, if m∠2=36, hence to find m∠1 we would make the following calculation:
m∠1 + m∠2 = 90
Substitute
m∠1 + 36 = 90
m∠1=90-36
m∠1=54
m∠1 would be 54
5. According to the given data we have the following:
The angles ∠3 and ∠4 are supplementary or form a linear pair
Therefore, if m∠4=75, hence to find m∠3 we would make the following calculation:
m∠3 + m∠4 = 180
m∠3 + 75=180
m∠3=180-75
m∠3=105
m∠3 would be 105