# Math Help - question about "mils"

I have a difficulties calculating "mils". The question says that a mil is the measurement of an arc that is equal to $1/6400$ of a circle.

Now, it's asking me to calculate the measurement in radians of an angle that measures 1 mil.

To my understanding, a circle is equal to $2{\pi}$ so I calculated: $\frac{2\pi}{6400}$ which game 0.000981747703...

But it says that I need to round the answer to 2 decimals, which wouldn't make much sense. Am I calculating this correctly? Thank you

2. Hello andres
Originally Posted by andres
I have a difficulties calculating "mils". The question says that a mil is the measurement of an arc that is equal to $1/6400$ of a circle.

Now, it's asking me to calculate the measurement in radians of an angle that measures 1 mil.

To my understanding, a circle is equal to $2{\pi}$ so I calculated: $\frac{2\pi}{6400}$ which game 0.000981747703...

But it says that I need to round the answer to 2 decimals, which wouldn't make much sense. Am I calculating this correctly? Thank you
Your calculation is OK, and to 2 d.p. the value is 0.00 radians - which doesn't sound particularly useful. Perhaps the question means to 2 s.f., in which case it's 0.00098.

3. Originally Posted by andres
I have a difficulties calculating "mils". The question says that a mil is the measurement of an arc that is equal to $1/6400$ of a circle.

Now, it's asking me to calculate the measurement in radians of an angle that measures 1 mil.

To my understanding, a circle is equal to $2{\pi}$ so I calculated: $\frac{2\pi}{6400}$ which game 0.000981747703...

But it says that I need to round the answer to 2 decimals, which wouldn't make much sense. Am I calculating this correctly? Thank you
Hi andres,

A radian approximately equals 57.2958 degrees

A milliradian (mil) measures 1/1000 of 57.2958 degrees or .06 degrees to 2 decimal places. If you want, you can convert that to radians.

Hello andresYour calculation is OK, and to 2 d.p. the value is 0.00 radians - which doesn't sound particularly useful. Perhaps the question means to 2 s.f., in which case it's 0.00098.

Thank you so much, I will answer 0.00 as it says that I need to round the answer to 2 decimals, I just wanted to make sure that I was doing it correctly! Thanks again

5. Originally Posted by masters
Hi andres,

A radian approximately equals 57.2958 degrees

A milliradian (mil) measures 1/1000 of 57.2958 degrees or .06 degrees to 2 decimal places. If you want, you can convert that to radians.

Hi, the book speficies that I need to base 1 Mil as 1/6400 of a circle. Thanks!

6. Originally Posted by andres
I have a difficulties calculating "mils". The question says that a mil is the measurement of an arc that is equal to $1/6400$ of a circle.

Now, it's asking me to calculate the measurement in radians of an angle that measures 1 mil.

To my understanding, a circle is equal to $2{\pi}$ so I calculated: $\frac{2\pi}{6400}$ which game 0.000981747703...

But it says that I need to round the answer to 2 decimals, which wouldn't make much sense. Am I calculating this correctly? Thank you
Originally Posted by andres
Hi, the book speficies that I need to base 1 Mil as 1/6400 of a circle. Thanks!
Yes, but you asked about the angle that forms the arc that is 1/6400 of the circle. Arc length and arc degree are two different things