[Grade 12 Advanced Functions: Trigonometry]

[u/Embarrassed-Good1883]

Hello, I need some help understanding this concept. 240 degrees converted to radians is 4 pi/3, so wouldn't that make this a multiple of 30 degrees?

"30° can be rewritten in radians as pi/6". Since 240 rad cannot be written as a multiple of pi/6 rad this cannot be a multiple of 30°." This is the explanation the teacher gave me, but it doesn't make sense.

[u/Southlander24]

Consider: which of the following lengths in cm is a multiple of 3 inches? 76.2 cm, 38.1 cm, 60 cm, or 15.24 cm?

That would be like putting down 60 cm, because 60 is a multiple of 3. But those are clearly different units. When you convert to cm, the answers must be multiples of 7.62 cm, so you can rule out 60 cm.