Bearings

[hardy summit]

GCSE level

[candid frost]

1. make a triangle out of those points

2. find angle ABC (it is 88)

3. use sin rule to find the side AC

4. use the speed of the boat with the length that u find from using sin rule to find the time it takes to get from point C to point A

👍 😃

[hardy summit]

hello ! i got 18 mins but am wondering if u got the same/similar

thank u for the working out it was very helpful

[candid frost]

i havent worked it out yet one sec

[hardy summit]

ok!

[obsidian mountain]

can you send your working out?

[hardy summit]

i drew the shapes on paper but i'm 100 % sure they're right

from step 3 onwards

AC = 1.6/ sin 48 * sin 88 which is 2.15 km
t = d/s so 2.15/ 7.2 = 0.2988 hrs and then that times 60 = 17.93 mins so 18

[obsidian mountain]

wait

[hardy summit]

?

[obsidian mountain]

how did you work out 48

I think I’m being slow lmfao

[viscid flare]

its 98-50

[candid frost]

98-50

when u rearrange sin rule

i got

[obsidian mountain]

lmfao I used 94

mb mb

yea seems right

[candid frost]

1.6*sin(48)/sin(88)

then that gives about 1.1

[viscid flare]

i think youve done sine rule wrong

[candid frost]

maybe

but at least i knew the method

[hardy summit]

why have u divided

[viscid flare]

is x/sin88 = 1.6/sin48

[hardy summit]

im so confused

[candid frost]

at least i was for the journey along the way

[candid frost]

yes

[viscid flare]

so its x = 1.6/sin48 * sin88

[candid frost]

lemme check

nonono

i think i got right

[viscid flare]

im not sure you did

[candid frost]

u dont get sin(x)*sin(y) divided by the length

[viscid flare]

nothing is being divided by the length though

[hardy summit]

who is dividing by the length

i don't understand

[viscid flare]

you divide the length by sin48

and times it by sin88

[candid frost]

it goes from 14.6/sin(105) = x/sin(62)

to 14.6*sin(62)/sin(105)

if u apply the same rearranging

thats what i get

idk how u did it

[hardy summit]

what

where r u getting these numbers from

[candid frost]

the screenshot i sent

its just an example of someone rearranging it correctly

so if u apply the way that he rearranges it

u should get it right

[hardy summit]

no but my equation is

[hardy summit]

ac/sin88

nvm businessman did it

[viscid flare]

sorry for the messy writing

[hardy summit]

u are fast it's fine

[viscid flare]

👍

[candid frost]

bro i think i put the wrong number in the calc

[viscid flare]

right

[candid frost]

and i thought we were doing different things because of the way u typed it out

[viscid flare]

ohh

[candid frost]

SORRY GUYS

[hardy summit]

ah okay

[viscid flare]

nevermind then

[candid frost]

but yes u got the right answer avacado

good job

[hardy summit]

oh ok

thanks!