are all right triangles similar are all right triangles congruent are all right triangles 30 60 90 are all right triangles scalene are all right triangles isosceles are all right triangles equilateral are all right triangles equal are all right triangles 45 45 90 are all isosceles right triangles similar all right triangles are similar. true false are all isosceles triangles right triangles do all right triangles equal 180 degrees