A triangle is formed by points (6,0) , (0,0) and (0,6) . How many points with the integer coordinates are in the interior of the triangle ?

A triangle is formed by the coordinates (0,0) , (21,0) and (0,21). Then the number of integral coordinates strictly the triangle is-

The area of the triangle formed by the points (0,0),(3,0) and (0,4) is :

The area of triangle formed by the points (-5, 0), (0, -5) and (5, 0) is

the area of triangle formed by the points (0,0) (1,1) and (2,3) is

The area of triangle formed by the points (-5,0) ,(0,-5) and (5,0) is ……….

The triangle obtained by joining the points A(-5,0), B(5,0) and C(0,6) is

The area of triangle formed by the points (- 5 , 0) , (0 , -5) and (5 , 0) is …….. .

The coordinates of the vertices of a triangle are ( 4 , 6 , 0) ,( 0 , - 3 , 7) and ( - 4 , 0 , -1) , then the coordinates of the centroid of the triangle are _