View Compilation Error

0_0_20466608_17200.cpp: In function 'double Area(int, int, int, Point*)':
0_0_20466608_17200.cpp:12:21: error: invalid operands of types 'double' and 'Point* {aka point*}' to binary 'operator-'
     aa=sqrt((p[a].x-p<b>.x)*(p[a].x-p[b].x)+(p[a].y-p[b].y)*(p[a].y-p[b].y));  
                     ^
0_0_20466608_17200.cpp:12:25: error: expected primary-expression before '.' token
     aa=sqrt((p[a].x-p<b>.x)*(p[a].x-p[b].x)+(p[a].y-p[b].y)*(p[a].y-p[b].y));  
                         ^
0_0_20466608_17200.cpp: At global scope:
0_0_20466608_17200.cpp:35:2: error: expected unqualified-id before '<' token
 }</b>  
  ^