- #1
D.T.
- 5
- 0
About a triangle...
Hey guys, this is my second posts here, last week was my first week of uni. I've done most of my Phys homework but I'm stuck with the last 3 questions
1.Given three points A,B and C which have coordinates (1,2,3); (2,-1,5); (-3,4,1). Find the area of triangle which has these three pints at its corners.
What I've tried is I drew these three points on a X,Y,Z plane and work out the area by finding the surface area by drawing each in 2D X,Y , X,Z and Y,Z. But that didn't seem to work.:tongue2:
2.The three vectors shown below, have magnitudes a=3.00, b=4.00 and c=10.0. a) Calculate the x and y components of these vectors. b) Find the numbers p and q such that c= pa + qb.
I have been doing research on google and Wiki for probably three hrs and i stil don't know anything about it.(I'm sorry, pls help, I'm just too dumb for it.:uhh: )
3.Show that, the vectors A = 3i + (-2j) + k, B = i - 3j + 5k and C = 2i + j - 4k can form the rectangular triangle.
Like, I want to know what to do first and what formulas to use to solve these questions. I got absolutely no ideas how to handle these question, from high school I have learned nothing about 3D coordinates things, only 2D..
Thanks a lot guys.
Hey guys, this is my second posts here, last week was my first week of uni. I've done most of my Phys homework but I'm stuck with the last 3 questions
1.Given three points A,B and C which have coordinates (1,2,3); (2,-1,5); (-3,4,1). Find the area of triangle which has these three pints at its corners.
What I've tried is I drew these three points on a X,Y,Z plane and work out the area by finding the surface area by drawing each in 2D X,Y , X,Z and Y,Z. But that didn't seem to work.:tongue2:
2.The three vectors shown below, have magnitudes a=3.00, b=4.00 and c=10.0. a) Calculate the x and y components of these vectors. b) Find the numbers p and q such that c= pa + qb.
I have been doing research on google and Wiki for probably three hrs and i stil don't know anything about it.(I'm sorry, pls help, I'm just too dumb for it.:uhh: )
3.Show that, the vectors A = 3i + (-2j) + k, B = i - 3j + 5k and C = 2i + j - 4k can form the rectangular triangle.
Like, I want to know what to do first and what formulas to use to solve these questions. I got absolutely no ideas how to handle these question, from high school I have learned nothing about 3D coordinates things, only 2D..
Thanks a lot guys.