Answer:

Step by step
Remember, a reference angle is a positive acute angle that represents an angle θ of any measurement.
a)
, then its reference angle is 
b)
is in the second cuadrant, then its reference angle is 
c)
, then it is in the first cuadrant and the reference angle is
.
d)
and it is in the third cuadrant, then its reference angle is 
Answer:
4x1
Step-by-step explanation:
Answer:
6a-18
Step-by-step explanation:
Answer:
i do not understand
Step-by-step explanation:
64; Line pq is correspondent with line ab and triangle PQR is 4 time as big as triangle ABC.