`x+y=7` and `a x^2+2h x y+a y^2=0,(a!=0)` , are three real distinct lines forming a triangle. Then the triangle is
(a)isosceles (b) scalene equilateral (d) right angled

x+y=7 and a x^2+2h x y+a y^2=0,(a!=0) , are three real distinct lines forming a triangle. Then the triangle is isosceles (b) scalene equilateral (d) right angled

The straight lines x+y=0, 3x+y-4=0 and x+3y-4=0 form a triangle which is (A) isosceles (B) right angled (C) equilateral (D) scalene

If a vertex, the circumcenter, and the centroid of a triangle are (0, 0), (3,4), and (6, 8), respectively, then the triangle must be (a) a right-angled triangle (b) an equilateral triangle (c) an isosceles triangle (d) a right-angled isosceles triangle

Can an equilateral triangle be a, an acute-,b. a right-, and c. an obtuse-angled triangle ? What about isosceles and scalene triangles ?

Show that the straight lines x^2+4xy+y^2=0 and the line x-y=4 form an equilateral triangle .

Show that the common tangents to the parabola y^2=4x and the circle x^2+y^2+2x=0 form an equilateral triangle.

Show that the common tangents to the parabola y^2=4x and the circle x^2+y^2+2x=0 form an equilateral triangle.

Write the coordinates of the orthocentre of the triangle formed by the lines x y=0\ a n d\ x+y=1.

. The lines (a+b)x + (a-b) y-2ab=0, (a-b)x+(a+b)y-2ab = 0 and x+y=0 form an isosceles triangle whose vertical angle is

. The lines (a+b)x + (a-b) y-2ab=0, (a-b)x+(a+b)y-2ab = 0 and x+y=0 form an isosceles triangle whose vertical angle is