Are the points `A(3,6,9),B(10,20,30) and C(25,-41,5)` the vertices of are right angle triangle?

Are the points A(3,6,9),B(10,20,30) and C(25,-41,5) the vertices of a right angled triangle?

(a) show that the triangle with vetices (0,7,10) (-1,6,6) and (-4,9,6) is right angled (b) are the points A(3,6,9) B (10,20,30) and C(25,41,5) the vertices of a right angled triangle

Using vector method, show that the points A(1,-1,0), B(4,-3,1) and C(2,-4,5) are the vertices of a right -angled triangle.

Without using pythagoras theorem, show that the points A(-1,3) ,B(0,5) and C(3,1) are the vertices of a right angled triangle

Without using Pythagoras theorem,show that the points A(0,4),B(1,2) and C(3,3) are the vertices of a right angled triangle.

Show that the points (0,7,10),(-1,6,6) and (-4,9,6) are the vertices of as right angled triangle

Show that the points A(0,1,2),B(2,-1,3) and C(1,-3,1) are vertices of an isosceles right-angled triangle.

Prove that the points (-3,0),(1,-3) and (4,1) are the vertices of an isosseles right- angled triangle.Find the area of this triangle.

Without using Pythagoras theorem, show that the points A(2,1) , B(5,4) and C(3,6) are the vertices of a right-angled triangle.