Round 4.409 to one decimal place

It is 4.4. To round it to one decimal place, you need to round it to the tens decimal place, which is currently the number 4. Since it does not have a number bigger than five before it, you don't change the number four and you keep it so the answer is 4.4. Hope this helps. 

4.409 to one decimal place 
4.409 is three decimal place 
4.40 is gonna be 2 decimal place 
4.4 is gonna be 1 decimal place 

1 decimal place means there is on number after the decimal 
4.4 is one decimal place 

Hello! i hope this
since the cosine is the ratio of the adjacent side to the hypotenuse, you can see that cos 60° = ½. answer. according to the property of cofunctions (topic 3), sin 30° is equal to cos 60°. sin 30° = ½.