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

___ is the longest side of the right angled triangle.

Show that the angle bisectors of a triangle are concurrent.

Show that the angles of an equilateral triangle are 60^@ each.

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 z=1+3i then show that z , iz and z+zi form a right angled isosceles triangle.

What type of quadrilateral is formed when the following pairs of congruent triangles are joined together ? (i) Equilateral triangle . (ii) Right angled triangle. (iii) Isosceles triangle.

If vec xa n d vec y are two non-collinear vectors and A B C isa triangle with side lengths a ,b ,a n dc satisfying (20 a-15 b) vec x+(15b-12 c) vec y+(12 c-20 a)( vec xxx vec y)=0, then triangle A B C is a. an acute-angled triangle b. an obtuse-angled triangle c. a right-angled triangle d. an isosceles triangle

If one side of a triangle is double the other, and the angles on opposite sides differ by 60^0, then the triangle is equilateral (b) obtuse angled (c) right angled (d) acute angled