could any one help please..yet to be taught the cosine rule but trying to learn it myself but un sure what buttons to press on my calculator..
i have a triangle A, B,F. <A=52 side f=3000 and b=6000..i need to find the other side and two angles..
thanks
jim
Don't try to do it in one go on your calculator, they all differ and may not
behave in the same way as someone elses calculator.
Find 3000^3, and 6000^2, 3000*6000 and cos(52), these are single stage
operations then write out what what you now have to calculate.
So cos(52)=0.615661 (clear the calculator, make sure you are in degrees
mode, then enter 52 and hit the cos button to get this, write it down).
3000^2=9e6 (which means 9 * 1000000, clear the calculator enter 3000
then hit the x^2 key, or enter x 3000 =)
6000^2=3.6e7 (which means 36 *1000000, as above)
3000*6000=1.8e7 (which means 18 * 1000000)
then calculate:
9e6+3.6e7-2*3.6e7*0.61661=22836.204
then hit the square root key to get 4778.7..
RonL
Hello, Jim!
Could any one help please?
Yet to be taught the cosine rule but trying to learn it myself
but unsure what buttons to press on my calculator.
I have a triangle with:
I need to find the other side and two angles.
To find side
We have: .
Be sure your calculator is in degree mode.
On your calculator, enter:
. .
It is essential that you press at the end of this line.
. . Then press: .
You should get: .
To find angle
We have: .
Enter: . . . . . and get:
Press . . . . and get:
Hence: . **
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If , then: .
We have: .
But this doesn't check out . . .
. .
. .
. . ??
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**
Whenever we use , there are always two possible answers.
One is the acute angle on your calculator screen,
. . the other is its supplement (subtract from 180°)
The calculator said , which didn't work.
. . So it must be: .
If , then
The solution is: .
. . and these check out . . .