The three points `(-2,2)(9,-2),a n d(-4,-3)` are the vertices of (a) an isosceles triangle (b) an equilateral triangle (c) a right-angled triangle (d) none of these

The points (0,8/3),(1,3) , and (82 ,30) are the vertices of (A) an obtuse-angled triangle (B) an acute-angled triangle (C) a right-angled triangle (D) none of these

Show that the given points (1,1) ,(5,4) and (-2,5) are the vertices of an isosceles right angled triangle.

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

Show that the points A(4, 7 ) B (8,4) and C(7,11) are the vertices of a right angled triangle.

The points (-a ,-b),(a , b),(a^2,a b) are (a) vertices of an equilateral triangle (b) vertices of a right angled triangle (c) vertices of an isosceles triangle (d) collinear

If all the vertices of a triangle have integral coordinates, then the triangle may be (a) right-angled (b) equilateral (c) isosceles (d) none of these

If acosA=bcosBthen show that the triangle is either an isosceles triangle or right angled triangle.

The points (a , b),(c , d), and ((k c+l a)/(k+l),(k d+l b)/(k+l)) are (a) vertices of an equilateral triangle (b) vertices of an isosceles triangle (c) vertices of a right-angled triangle (d) collinear

If cos^2A+cos^2B+cos^2C=1,t h e n A B C is (a)equilateral (b) isosceles (c)right angles (d) none of these