A level maths Q Watch

Defence11
Badges: 9
Rep:
?
#1
Report Thread starter 3 weeks ago
#1
Find the direction of the vector 12i-5j. Answer is 337.38. I don’t get why u do 360-22.62. Thanks.
0
reply
Pangol
Badges: 12
Rep:
?
#2
Report 3 weeks ago
#2
(Original post by Defence11)
Find the direction of the vector 12i-5j. Answer is 337.38. I don’t get why u do 360-22.62. Thanks.
The convention is to measure angles by starting by pointing from the origin along the positive x-axis, and then turning anticlockwise. So although the angle is 22.62 degrees below the x-axis (and could be expressed as -22.62 degrees), it can also be expressed in the way that you say.
0
reply
Defence11
Badges: 9
Rep:
?
#3
Report Thread starter 3 weeks ago
#3
(Original post by Pangol)
The convention is to measure angles by starting by pointing from the origin along the positive x-axis, and then turning anticlockwise. So although the angle is 22.62 degrees below the x-axis (and could be expressed as -22.62 degrees), it can also be expressed in the way that you say.
Why minus 360 tho. Why not minus 180?
0
reply
Defence11
Badges: 9
Rep:
?
#4
Report Thread starter 3 weeks ago
#4
Can u draw me a diagram
(Original post by Defence11)
Why minus 360 tho. Why not minus 180?
0
reply
Pangol
Badges: 12
Rep:
?
#5
Report 3 weeks ago
#5
(Original post by Defence11)
Can u draw me a diagram
Not a very good one, but OK... Theta is easily seen to be 22.62 degrees (4 s.f.), and alpha is the angle you want.
Name:  Untitled.jpg
Views: 15
Size:  9.4 KB
1
reply
X

Quick Reply

Attached files
Write a reply...
Reply
new posts

All the exam results help you need

1,000

people online now

225,530

students helped last year

University open days

  • University of Dundee
    Undergraduate Open Day Undergraduate
    Mon, 26 Aug '19
  • University of Aberdeen
    General Open Day Undergraduate
    Tue, 27 Aug '19
  • Norwich University of the Arts
    Postgraduate (MA) Open Day Postgraduate
    Sat, 31 Aug '19

Do you have grade requirements for your sixth form/college?

At least 5 GCSEs at grade 4 (65)
14.51%
At least 5 GCSEs at grade 5 (69)
15.4%
At least 5 GCSEs at grade 6 (84)
18.75%
Higher than 5 GCSEs at grade 6 (181)
40.4%
Pass in English and Maths GCSE (21)
4.69%
No particular grades needed (28)
6.25%

Watched Threads

View All