To convert degrees to radians, you can use the following formula:

Radians = Degrees × (π / 180)

So, for 40 degrees:

Radians = 40 × (π / 180)

Radians = 2π / 9

Radians ≈ 0.698

Therefore, 40 degrees is approximately 0.698 radians.

For more information, you can use online converters. Here's a link to a Google Search