11. QUADRANTS
Q : (1,0) lies in which Quadrant?.
XX’ O
Y
Y’
III
III IV
(+,+)(-,+)
(-,-) (+,-)
Ist? IInd?
A: None. Points which lie on the axes do not lie in any quadrant.
14. SECTION FORMULA
L N M
H
K
XX’
Y’
O
Y Clearly AHP ~ PKB
AP AH PH
BP PK BK
1 1
2 2
x x y ym
n x x y y
2 1 2 1mx nx my ny
P ,
m n m n
15. MIDPOINT FORMULA
If P(x,y) is a Midpoint of A(x1, y1) and B(x2,y2)
AP=PB
m:n 1:1
1 2 1 2x x y y
P ,
2 2