Qualification > Math

IGCSE MATHS DOUBTS HERE !!!!

<< < (3/34) > >>

elemis:
Question 1

I am assuming you are asking for the homeward journey bearing.

I got 18 degrees first because adjacent angles add up to 180 (162 + 18 = 180).

Next, 360-(260+18) = 82 degrees. The angle adjacent to 100 (100 = 82+18) is 80 degrees (in maroon).

Using we see that cos-1 x = 0.85191.....

hence x =31.5797....  Hence, 80 - angle x = 48.4 degrees

elemis:
Question 2

See pic.

I hope my answers are right :D

WARRIOR:
question  1 is right + rep

but question 2


Look at your diagram edited by me

you see the 180 * angle i drew?

yea you find the angle in the small right triangle = 180-90 + 40 = 50*

   Then you find the angle in the middle which is = approx 73.2
   Then 180 - 73.2 + 50 = 56.8

THEN 56.8 - 90 = 33.2 <---right answer !

my teacher said you shouldnt have assumed the whne you drew that line in the middle that you cut the angle exactly into a half , you get the point?

edit : oops i forgot to attaach

elemis:
Is this a question from your textbook ?

WARRIOR:

--- Quote from: Ari Ben Canaan on September 17, 2010, 06:57:47 am ---Is this a question from your textbook ?

--- End quote ---
yea why?

Navigation

[0] Message Index

[#] Next page

[*] Previous page