Find the vlaue of cos B for the triangle formed by joining the points A (6,11 , 2 ) , B (1 , - 1 , 2) and C (1 , 2 , 6 ) .

Find the value of cos B for the triangle formed by joining the points A(6,11,2),B(1,-1,2)and C(1,2,6).

Find the ortho -centre of the triangle formed by joining the points A(-2,-3),B(6,1)andC(1,6) .

Find the area of the triangle formed by the points A(0, – 1), B(– 2, 6) and C(– 3, – 5)

Find the area of the triangle formed by the following points ( 2 , 0) , ( 1 , 2) , ( 1 , 6)

Find the area of the triangle formed with the points A(1,2,3), B(2,3,1), C(3,1,2) .

Prove that the triangle formed by joining the points ( 2 , 3 , - 1) , ( 4 , 5 , 0) , ( 2 , 6 , 2) is and isosceles triangle .

Find the value of a for which the area of the triangle formed by the points A(a ,\ 2a),\ \ B(-2,\ 6) and C(3,\ 1) is 10 square units.

Find the value of a for which the area of the triangle formed by the points A(a , 2a), B(-2, 6) and C(3, 1) is 10 square units.

Find the area of the triangle formed by the line joining the points (1,7),(2,-5) and co -ordinates axes.

Find the slope of the line joining the two given points (AS_(1)) A (2 , - 2) , B ( - 6 , - 2) .