Which one of the following cannot be the ratio of angles in a right-angled triangle ?

a. 1 : 2 : 3

b. 1 : 1 : 2

c. 1 : 3 : 6

d. None of these

• for it to be right-angled, largest angle must be 90.
  C
  check all options:
  a> 3x=90; x=30 so other two angles are x=30 and 2x=60 which is possible.
  b> 2x=90; x=45 so other two are x=45 and 45.possible
  c> 6x=90;x=15 so other two are x=15 and 3x=45; 15+45+90 is not 180. ans is c.
• 10 years agoHelpfull: Yes(2) No(1)
• Ans:c
  sum of angle of triangle=180.In right angle triangle two sides must be at right angle.
  1st angle=(1/10)*180=18
  2nd angle=(3/10)*180=54
  3rd angle=(6/10)*180=108.There is no right angle between two sides.
• 10 years agoHelpfull: Yes(0) No(1)