One of two adjacent angles has a measure of 45 degrees. If the whole angle is 75 degrees, how big is the other adjacent angle?

Question

Math homework; Seventh grade.

Answer 1

Adjacent angles are additive because they share a common edge and have the same vertex.  Therefore,

 

75º = 45º + x

 

where x =  the unknown angle.

 

Solving for x, 

 

x = 75º − 45º = 30º

Answer 2

75º-45º=30º

Answer 3

What adjacent angle and what whole angle?