A relation is a function when...

A function is a relation in which each input has only one output.

Step-by-step explanation:

a relation from a set x to a set y is called a function if each element of x  is related to exactly one element in y.  

Step-by-step explanation:

answer

a,b, and d

explanation

a reflection angle is more than

but less than;

an angle that measures

is a reflex angle.(true)

an angle that measures less than

is acute.(true)

provided we are considering angles greater or equal to zero.

an acute angle lies in the range.

an obtuse angle is less than 180° but more than 90°

an angle that measures 300° is obtuse (false)

an angle that measures 65° is an acute angle.(true)

you need to rotate this triangle about the origin 270 degrees clockwise to create the full square.