Embarassing but necessary question

analyse this

Ok its kinda shameful cause it an A question but how do you turn 5/2 radians into degress (to the nearest degree)?

fallon54

What paper is it off?

analyse this

2001 paper 2 q4 part a

Fuzzy_Dunlop

kinda had to think about it there too but i think its this
-theres pi radians in 180 degrees so 1 rad is 180/pi, then multiply this by 5/2

analyse this

yeh thats the way i was doing it but I never thought of changing the pi to digit form!!:o silly billy:(

Lucas10101

playa3 wrote:

kinda had to think about it there too but i think its this
-theres pi radians in 180 degrees so 1 rad is 180/pi, then multiply this by 5/2

Is it not pi/180 * 5/2 = 0.04 Degrees which can't be right.

180/pi * 2.5 => 143 Degrees.

5 pi/2 Radians sounds better as there has to be a pi??
This would be 5(180)/2 which is 450 Degrees??

One Radian is 53.70 Degrees so 5/2 Radians is 53.70 *5/2 => 279.24 Degrees.

http://www.algebralab.net/lessons/lesson.aspx?file=Trigonometry_TrigDegRadian.xml
This site implies that:

So 5/2 would be the same method so it's done.

Lucas10101

Lucas10101 wrote:

Is it not pi/180 * 5/2 = 0.04 Degrees which can't be right.

180/pi * 2.5 => 143 Degrees.

Not Sure surprisingly.

Pi radians = 180 degrees
1 radian = 180 / Pi
5/2 radians = (5 / 2)*(180 / Pi)

As was said.

sunflowerz

am.......how bout using your Calculator????

thats what the DRG button is for?????

Lucas10101

Sure how else would you get degrees to the nearest minute and degree????? You would have to use the calculator,...how else....it was never implied otherwise?

sunflowerz

ya but isnt there a special button on most calculators where u just type it in in radians, press the button and its changed to degrees????

Steve01

Embarassing but necessary question

17 in most countries, 14 in Holland.

sunflowerz

Steve01 wrote:

17 in most countries, 14 in Holland.

LOL

Lucas10101

Regardless if there's a key or not.....students should know how it comes about and why it's happening after all for other Trigonometric questions.

Whim

I used Page 8 of the log tables. Gives the right answer anyway.

Tomlowe

for any angle A in degrees to get to A in radians (Ar)

A/180 = Ar/Pi

=> A(Pi)/180 = Ar

For any angle B in radians to get to B in degrees (Bd)

B/Pi=Bd/180

=> 180(B)/Pi = Bd