Answer: Reference angle= 40 degrees
Step-by-step explanation: Here we want to find the Reference angle for -230 degrees,
Step 1: Draw the angle in the standard position i.e. drawing the angle with its initial side on the positive x-axis and its vertex at the origin.
Step 2: By this, we get that -230 degrees lies in the third quadrant. (The quadrant is determined by the location of the terminal side of the angle.)
Step 3: To find the Reference angle we have to determine the absolute value of -230 degrees and which is 230 degrees.
Step 4: We have the formula to determine as the angle is in the 3rd quadrant we use 270-(given angle)=270-230=40
Step 5: 40 degrees is the reference angle for -230 degrees.