Bearings | Mathematics | Page 1

chrome crane Sep 9, 2024, 1:40 AM

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Please help me understand how I would possibly ever get the bearing for this. Question C

rustic orioleBOT Sep 9, 2024, 1:40 AM

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chrome crane Sep 9, 2024, 1:56 AM

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lost whale Sep 9, 2024, 1:58 AM

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use trigonometry

chrome crane Sep 9, 2024, 1:59 AM

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yea i know that much

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i should post my working

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currently got theta = tan ^ -1 (14/20)

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like the tutorial said to

chrome crane Sep 9, 2024, 2:00 AM

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lost whale use trigonometry

i just dont know how they got the degrees for it

lost whale Sep 9, 2024, 2:00 AM

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you put that into a calculator

chrome crane Sep 9, 2024, 2:01 AM

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I know that

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it wont let me

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i dont usually use calculators

lost whale Sep 9, 2024, 2:01 AM

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what do you mean by "it won't let me"? what calculator are you using, and what error do you get?

chrome crane Sep 9, 2024, 2:02 AM

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syntax error

chrome crane Sep 9, 2024, 2:02 AM

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lost whale what do you mean by "it won't let me"? what calculator are you using, and what e...

the online ones give decimals

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and the ones that ask for degrees give me

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wont let me put tan^-1

lost whale Sep 9, 2024, 2:04 AM

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https://www.desmos.com/scientific

chrome crane Sep 9, 2024, 2:05 AM

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uhm should it be in degrees

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or is that in degrees?

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yup yup

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thanks

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so would my answer be 35 degrees

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and is that correct?

lost whale Sep 9, 2024, 2:06 AM

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well 35 degrees is the right angle, although we should format it properly for a bearing

chrome crane Sep 9, 2024, 2:07 AM

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sorry dude im not quite sure. we havent even started this topic

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so i got no clue

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went through a couple videos

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how do we format it?

lost whale Sep 9, 2024, 2:09 AM

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we just have to state which line we measure from and which direction. so "35 degrees west of north" (shorthand N35°W) would be correct

chrome crane Sep 9, 2024, 2:10 AM

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and just to make sure

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the tutorial i have says we are going clockwise from north

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https://www.youtube.com/watch?v=6QtbiFeMm2U&t=181s

YouTube

Maths at Home

How to Calculate a Bearing Using Trigonometry

The full lesson and more can be found on our website at https://mathsathome.com/calculating-bearings

In this lesson we learn how to find a bearing using trigonometry. We look at a variety of examples using trigonometry to find the bearing from north.

▶ Play video

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does this have any implications on the answer

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because im missing out an entire turn axis at the end

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cause we've figured out the theta

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but not the bearing

lost whale Sep 9, 2024, 2:13 AM

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there are two different formats for bearings: there is an azimuth bearing which is up to 360° clockwise from north, and there is a relative bearing which can be clockwise or counterclockwise up to 90° from north or south (whichever is closer)

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so "N35°W" is the correct relative bearing, but to find the azimuth we need to find the clockwise angle since 35° is counterclockwise

chrome crane Sep 9, 2024, 2:14 AM

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So if we were to start from the bottom

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would it be going north so 360 minus 35?

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from my understanding of bearings anyways

lost whale Sep 9, 2024, 2:15 AM

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chrome crane would it be going north so 360 minus 35?

that would give us the clockwise angle from north, which is what we're looking for

chrome crane Sep 9, 2024, 2:15 AM

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Omg

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dude thanks

#Bearings