always sometimes never
if two sides of one triangle are proportional to two sides of a 2nd triangle the triangles are similar
sometimes
two isosceles trapezoids
sometimes
two rectangles
sometimes
two regular polygons
sometimes
two rhombuses
sometimes
two scalene triangles
sometimes
Two equilateral triangles
always
Two squares
always
an equilateral triangle and an equiangular triangle
always
two isosceles triangles are similar if a base angle of one is congruent to a base angle of another
always
two isosceles triangles are similar if the vertex angle of one is congruent to the vertex angle of another
always
two regular hexagons
always
a kite and a parallelogram
never
a right triangle and an acute triangle
never
an isosceles triangle and a scalene triangle
never
Two isosceles triangles
sometimes
Two right triangles
sometimes
a right triangle and a scalene triangle
sometimes