IGCSE MATHS DOUBTS HERE !!!!

[Most UniQue™]

Bearings:

A,B,C,D are the four corners of a rectangular plot marked out on level ground.Given that the bearing of B from A is 090*, calculate the bearing of:
a) B from C
b) A from C
c) D from C

Plz explain it so that I cn get it Thanks

[astarmathsandphysics]

I will put up a diagram now.

[Most UniQue™]

I will put up a diagram now.

ok Thanks ill be waiting

[astarmathsandphysics]

here

[SauD~]

9^1/2 x 3^5/2

9^1/2 = Square root of 9 = 3 which is same as 3^1

so 3^1 X 3^5/2

1/1 + 5/2 = 3.5

1x2  +  5x1  = 2 + 5 = 7   = 3.5
----    ----    -----    --
1x2      2x1       2       2

3^3.5 or 3^7/2

3^2/3 x 3^-1/6

2/3 -1/6 = 3/6

2x2 - 1x1   = 4-1 = 3   
----  ----     ----   --
3x2    6x1      6      6

so 3^3/6

(3^7/2 ) / (3^3/6)

(7/2) - (3/6) = 3

7x3 - 3x1 =  21-3  = 18    = 3
---    ---     -----    ---
2x3   6x1       6        6

so 3^3 = 27

Okay saud? 

ANNIE THANKS A LOT but i have got a easier method by using my brain


9^1/2 = ,/9 = 3            ,/ --- > square root sign
then all are 3
so we can add same number when multiply and subtract when divide so:
3^(1 + 5/2) - (2/3 + (-1/6)) so the answer comes 3^3 = 27  

BUT I REALLY APPRECIATE YOUR HELP, ANNIE

[SauD~]

here

Sir, wasn't B suppose to be a bearing from A at 90 degrees?

[Most UniQue™]

here

but Sir the answer u gave is wrong!
a) 310
b)270
c)220

[SauD~]

but Sir the answer u gave is wrong!
a) 310
b)270
c)220

Answer key?

[Amii]

ANNIE THANKS A LOT but i have got a easier method by using my brain


9^1/2 = ,/9 = 3            ,/ --- > square root sign
then all are 3
so we can add same number when multiply and subtract when divide so:
3^(1 + 5/2) - (2/3 + (-1/6)) so the answer comes 3^3 = 27  

BUT I REALLY APPRECIATE YOUR HELP, ANNIE

LOL that's cool  
And not a problem at all 

[Arthur Bon Zavi]

I think Astar is right.

[astarmathsandphysics]

Sir, wasn't B suppose to be a bearing from A at 90 degrees?
B says A from C

When It says 'from C' it means you are at C and want to go to A

[SauD~]

Bearings:

A,B,C,D are the four corners of a rectangular plot marked out on level ground.Given that the bearing of B from A is 090*, calculate the bearing of:
a) B from C
b) A from C
c) D from C

Plz explain it so that I cn get it Thanks

Sir, i meant the bold part in above quote. 

[astarmathsandphysics]

One mo

[astarmathsandphysics]

my corrected answer

[SauD~]

That's exactly what i told pro the answer, but he says we are wrong