# Calculation Problem

• Jan 17th 2009, 06:37 PM
Serialkisser
Calculation Problem
My calculator is defekt, and I need to finish an assignment in trigonometry.
Does anyone know any good online calculator to use sin,cos and tan ?

Im currently using this one : eCalc - Online Scientific Calculator
seems like a good calculator, but I dont get the following:

I am looking at a sample:

Quote:

Let x represent the hypotenuse, side AC.

sin = O/H
sin56=32/x
xsin56=32
x=32/sin56
x=38.6cm

Dividing 32 by sin 56 using the above calculator gives me a totally different solution. How will I get the correkt answer using that calculator ?
• Jan 17th 2009, 06:41 PM
mr fantastic
Quote:

Originally Posted by Serialkisser
My calculator is defekt, and I need to finish an assignment in trigonometry.
Does anyone know any good online calculator to use sin,cos and tan ?

Im currently using this one : eCalc - Online Scientific Calculator
seems like a good calculator, but I dont get the following:

I am looking at a sample:

Quote:

Let x represent the hypotenuse, side AC.

sin = O/H
sin56=32/x
xsin56=32
x=32/sin56
x=38.6cm
Dividing 32 by sin 56 using the above calculator gives me a totally different solution. How will I get the correkt answer using that calculator ?

For the given input, the calculator is giving you the correct output. Either the input is wrong or the answer you're checking against is wrong.
• Jan 17th 2009, 06:43 PM
Serialkisser
I tried everything, what Input would be correct to get 38.6 ?

It clearly shows that 32 has to be divided by sin 56 - I tried the other way too; but the output wasnt the same as the solution in the example which is 38.6.
• Jan 17th 2009, 06:47 PM
mr fantastic
Quote:

Originally Posted by Serialkisser
I tried everything, what Input would be correct to get 38.6 ?

It clearly shows that 32 has to be divided by sin 56 - I tried the other way too; but the output wasnt the same as the solution in the example which is 38.6.

Sorry, are you saying your on-line calculator is NOT giving 38.6 ...?

38.6 is the correct answer for the euqtion you've posted. If the on-line calculator is NOT giving you this answer, can I hazard a guess and say it's giving you a negative answer ....? (This would happen if the calculator thought the angle was being measured in radians rather than degrees).
• Jan 17th 2009, 06:54 PM
Serialkisser
On the online calculator:
Input:

32/sin(56) = -61.355

2nd try:

sin(56)/32= -0.01

3rd try:

sin(56) = -0.521/32 = -0.01

No clue how to get the right answer ... what did you input ?
• Jan 17th 2009, 06:58 PM
mr fantastic
Quote:

Originally Posted by Serialkisser
On the online calculator:
Input:

32/sin(56) = -61.355

2nd try:

sin(56)/32= -0.01

3rd try:

sin(56) = -0.521/32 = -0.01

No clue how to get the right answer ... what did you input ?

The on-line calculator is assuming that angles are measured in radians. You have to tell it that the angle is being measured in degrees.

If it works like the Google calculator ( sin(30 degrees) - Google Search ) then you have to type "56 degrees" as part of the input.
• Jan 17th 2009, 06:59 PM
ronaldo_07
use this calculator

Scientific Calculator

input 56sin

then press 1/x

• Jan 17th 2009, 07:07 PM
Serialkisser
Somehow I have to use the 2nd function like in a scientific calculator; but the calculator I have given has no 2nd function and like you recognized it measures in radians ... i tried to put degrees beside it, but it didnt work... using the google calculator I get the sin number; but somehow I have to enter that number using the 2nd function in a regular scientific calculator to get my final answer ... do you know what to write to get that in google ?
• Jan 17th 2009, 07:11 PM
mr fantastic
Quote:

Originally Posted by Serialkisser
Somehow I have to use the 2nd function like in a scientific calculator; but the calculator I have given has no 2nd function and like you recognized it measures in radians ... i tried to put degrees beside it, but it didnt work... using the google calculator I get the sin number; but somehow I have to enter that number using the 2nd function in a regular scientific calculator to get my final answer ... do you know what to write to get that in google ?

I don't see the problem .....:

• Jan 17th 2009, 07:25 PM
Serialkisser
Got it :-) Now I can start working on it, thanks a lot.
• Jan 17th 2009, 07:52 PM
Serialkisser
Solved 3 Questions so far, but now there is the following:

sin = o/H
sin = 24/32
(The degree is a zero with a line crossing the middle.)
sin = 0.75

What should I input in google ? I tried 0.75/sin(0 degrees)
but the answer didnt come up :S
• Jan 17th 2009, 08:31 PM
mr fantastic
Quote:

Originally Posted by Serialkisser
Solved 3 Questions so far, but now there is the following:

sin = o/H
sin = 24/32
(The degree is a zero with a line crossing the middle.)
sin = 0.75

What should I input in google ? I tried 0.75/sin(0 degrees)
but the answer didnt come up :S

Your first mistake is in not having an angle. Sin of what = 24/32.

So the equation should be sin(a) = 24/32 and solve for a.

arcsin(3/4) in degrees - Google Search