# Stuck on Q12b - Sine rules question AS Pure Maths

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What do they mean by the answer:

"That the angles have been measured from ground level"

EDIT: SOLVED

Last edited by GogetaORvegito?; 1 month ago

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#2

The model, as shown in the diagram, has the base of the two triangles at ground level. Imagine instead that the angles were measured at eye height - this would not match up with the model.

Dan

Data Science, MSc @ HWU

Dan

Data Science, MSc @ HWU

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(Original post by

The model, as shown in the diagram, has the base of the two triangles at ground level. Imagine instead that the angles were measured at eye height - this would not match up with the model.

Dan

Data Science, MSc @ HWU

**Heriot-Watt University - Student Rep**)The model, as shown in the diagram, has the base of the two triangles at ground level. Imagine instead that the angles were measured at eye height - this would not match up with the model.

Dan

Data Science, MSc @ HWU

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#4

This method of measuring heights is done from the ground - you look up at what you're measuring and work out the angle between the ground and that point. You then take a measurement on the ground (either to the base of the object or like the example here) and use trig to work out the height. You can measure from ground level as shown here or you can measure from a fixed point above the ground (which is probably easier than getting right down on the ground!). If you do that though you have to adjust your model to account for it, which has not been done in this example.

Dan

Data Science, MSc @ HWU

Dan

Data Science, MSc @ HWU

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#5

hey! i would recommend accessing the solutionbank of the textbook for worked solutions to the question so you can actually understand how to do it as opposed to just having an answer from the back of the book.

you can access them for all edexcel textbooks, but here is the one for edexcel pure maths year 1:

https://www.physicsandmathstutor.com...-maths-year-1/

good luck!

you can access them for all edexcel textbooks, but here is the one for edexcel pure maths year 1:

https://www.physicsandmathstutor.com...-maths-year-1/

good luck!

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#6

(Original post by

What do they mean by the answer:

"That the angles have been measured from ground level"

**GogetaORvegito?**)What do they mean by the answer:

"That the angles have been measured from ground level"

I've done a sketch to help visualise it http://sketchtoy.com/69289450

Last edited by laurawatt; 1 month ago

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(Original post by

You assume that that the surveyor has measured the angle from the ground, rather than from e.g. their eye-level (which would make the angles smaller)

I've done a sketch to help visualise it http://sketchtoy.com/69289450

**laurawatt**)You assume that that the surveyor has measured the angle from the ground, rather than from e.g. their eye-level (which would make the angles smaller)

I've done a sketch to help visualise it http://sketchtoy.com/69289450

**OH THATS WHAT THAT MEANT.**That sketch was so helpful! Thank you so much!

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(Original post by

hey! i would recommend accessing the solutionbank of the textbook for worked solutions to the question so you can actually understand how to do it as opposed to just having an answer from the back of the book.

you can access them for all edexcel textbooks, but here is the one for edexcel pure maths year 1:

https://www.physicsandmathstutor.com...-maths-year-1/

good luck!

**jasmeenx**)hey! i would recommend accessing the solutionbank of the textbook for worked solutions to the question so you can actually understand how to do it as opposed to just having an answer from the back of the book.

you can access them for all edexcel textbooks, but here is the one for edexcel pure maths year 1:

https://www.physicsandmathstutor.com...-maths-year-1/

good luck!

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reply

(Original post by

This method of measuring heights is done from the ground - you look up at what you're measuring and work out the angle between the ground and that point. You then take a measurement on the ground (either to the base of the object or like the example here) and use trig to work out the height. You can measure from ground level as shown here or you can measure from a fixed point above the ground (which is probably easier than getting right down on the ground!). If you do that though you have to adjust your model to account for it, which has not been done in this example.

Dan

Data Science, MSc @ HWU

**Heriot-Watt University - Student Rep**)This method of measuring heights is done from the ground - you look up at what you're measuring and work out the angle between the ground and that point. You then take a measurement on the ground (either to the base of the object or like the example here) and use trig to work out the height. You can measure from ground level as shown here or you can measure from a fixed point above the ground (which is probably easier than getting right down on the ground!). If you do that though you have to adjust your model to account for it, which has not been done in this example.

Dan

Data Science, MSc @ HWU

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