緊急!!!

1)Just point the coordinates (1,5) first
and then draw a vertical st.line (x = 1)
and then line up the point and origin[原點,(0,0)].

2)原點means origin in the coordinates plane,the coordinates of origin are (0,0)
3)just point out the point first,then draw a vertical line passing through the point.
after that,line the point and the origin.
area of (2,4):
(1/2)(2)(4)
= 4
area of (3,3)
= (1/2)(3)(3)
= 9/2
area of (4,2)
= (1/2)(4)(2)
= 4
area of (5,1)
= (1/2)(5)(1)
= 5/2
hence,the point (3,3) has a largest area of triangle