Final answer:
To convert angle A = -260° to a radian measure, multiply the degree measurement by π/180 to get -13π/9 radians.
Step-by-step explanation:
To convert an angle from degrees to radians, we use the fact that 360° is equal to 2π radians. Therefore, one degree is equal to π/180 radians.
To find the radian measure of an angle A = -260 degrees, use the conversion factor:
π radians/180 degrees = 1
Multiply the angle in degrees by this conversion factor:
A radians = -260° * (π/180)
A radians = (-260/180) * π
A radians = -13π/9.
So, the radian measure of angle A when it is -260° is -13π/9 radians.