Trig Function help! (1 Viewer)

SGSII

Active Member
Joined
Feb 18, 2012
Messages
471
Gender
Female
HSC
2013
Uni Grad
2016
Hi Guys :)
Could someone please help solve this question:
Capture.jpg
Thanks :)
 

crex

New Member
Joined
Apr 13, 2013
Messages
28
Gender
Male
HSC
N/A


EDIT: Working out is wrong, reason is below
 
Last edited:

braintic

Well-Known Member
Joined
Jan 20, 2011
Messages
2,137
Gender
Undisclosed
HSC
N/A
Answer correct, but not the working.

It should be: From the diagram, diameter of sun = 2 (149 000 000 tan 15.5').

It gives the same answer because the approximation we are using assumed sin2x = 2sinx for small angles. If you wanted a precise answer using the tan button on the calculator, your answer would be wrong.
 

crex

New Member
Joined
Apr 13, 2013
Messages
28
Gender
Male
HSC
N/A
Answer correct, but not the working.

It should be: From the diagram, diameter of sun = 2 (149 000 000 tan 15.5').

It gives the same answer because the approximation we are using assumed sin2x = 2sinx for small angles. If you wanted a precise answer using the tan button on the calculator, your answer would be wrong.
oh kk
thanks for pointing out my mistake :)
 

SGSII

Active Member
Joined
Feb 18, 2012
Messages
471
Gender
Female
HSC
2013
Uni Grad
2016
Thanks guys!
But the answer is 1343622km
 

Shazer2

Member
Joined
Feb 16, 2012
Messages
439
Gender
Male
HSC
2013
Can't you just split it in half and use right angle trig to find x/2, then times that by 2 to get answer?

IMG_0498.jpg
 
Last edited:

Shazer2

Member
Joined
Feb 16, 2012
Messages
439
Gender
Male
HSC
2013
Sorry I skimmed over your post and didn't see that, I only saw quoted part. Apologies!
 

Users Who Are Viewing This Thread (Users: 0, Guests: 1)

Top