Problems
The area of quadrilateral
The area of quadrilateral
Find the area of a quadrilateral with vertices A
(x1
,y1
), B
(x2
,y2
), C
(x3
,y3
), D
(x4
,y4
).
Input
The coordinates of successive vertices of a quadrilateral are given in a single line. All numbers are integers, not exceeding 100 by absolute value.
Output
The area of a quadrilateral, rounded to integers.
Input example #1
1 4 5 4 4 2 2 1
Output example #1
8