Final answer:
To find three angles coterminal to 1 radian, we can add or subtract any integer multiple of 2π radians from 1 radian. So, the three angles coterminal to 1 radian are: 7.28 radians, -5.28 radians, and 13.57 radians.
Step-by-step explanation:
An angle is said to be coterminal with another angle if it has the same initial side and terminal side. To find three angles coterminal to 1 radian, we can add or subtract any integer multiple of 2π radians from 1 radian.
So, the three angles coterminal to 1 radian are:
1 + 2π = 1 + 6.28 ≈ 7.28 radians
1 - 2π = 1 - 6.28 ≈ -5.28 radians
1 + 4π = 1 + 12.57 ≈ 13.57 radians