I got AY = -3a + 1/2 b for the first one. The other two I can't work out.
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Oops I forgot part (iii)!
Originally Posted by GAdams I got AY = -3a + 1/2 b for the first one. The other two I can't work out. why did you get 1/2 b? shouldn't it be 3/2 b?
Originally Posted by Jhevon why did you get 1/2 b? shouldn't it be 3/2 b? Sorry, I meant to type 1 1/2b , i.e. 1.5b
Last edited by GAdams; July 6th 2007 at 12:49 PM.
i) . ii) iii) . If are colinear, then is baricentre, so
Originally Posted by GAdams I got AY = -3a + 1/2 b for the first one. The other two I can't work out. Hello, as Jhevon pointed out: (ii): 1. 2. 3. As you can see is the mean (or average) of A and B. (iii)
Originally Posted by earboth Hello, as Jhevon pointed out: (ii): 1. 2. 3. As you can see is the mean (or average) of A and B. (iii) Thanks, I got it except the last bit, why is it 2/3 * OX?
Originally Posted by red_dog i) . ii) iii) . If are colinear, then is baricentre, so I don't quite get the last part about colinear and baricentre
If is the midpoint of and is the midpoint of , then and are medians in the triangle and . The intersection point of medians is the baricenter which splits each median in two segments in ratio 2:1.
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