Pi/6 is the reference angle for:

3pi/6

5pi/6

13pi/6

8pi/6

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

13

step-by-step explanation:

169-1=168

168-3=165

165-5=160

160-7=153

153-9=144

144-11=133

133-13=120

120-15=105

105-17=88

88-19=69

69-21=48

48-23=25

25-25=0

since it took 13times to completely subtract it hence its square root is 13

the answer is c)8

step-by-step explanaction: