Question

what is the reference angle of -775?

a) 550°
b) -305°
c) -55°
d) 305°

Answer 1

d)

Answer 2

its c)

Answer 3

mathod for any angle lower than 0 we add 360 till it gets between 0 and 360

Answer 4

can you show the work?

Answer 5

sorry - i got it wrong - i'd forgotten this bit of trigonometry. i.ve just checked it out:
the reference angle is the acute angle formed with reference to x axis. for example
reference angle for 120 degress is the acute angles in second quadrant which is 180-120 = 60 degrees. if the angle is greater than 360 then you subtract 360's until you get a value between 0 and 360 eg 380 - refernce angle is 380-36 = 20 degrees.
for 480 it is 480-360 = 120 then 180 - 120 = 60 degrees.
790 - 360 - 360 = 70 degrees.

Answer 6

refer to
www.analyzemath.com/Calculators/Reference_Cal.html

for negative angles this site takes the positive acute angle and returns 55 degrees for
-775

Answer 7

not -55!