Overlapping figure ratio and proportion question

• syncopation_music

  1 Oct 08, 08:47

  Hi all, i have this question would need your help to solve it .

   

  thanks in advance !

   

  

• eagle

  1 Oct 08, 08:52

  I shall assume u mean circle A is left and circle B is on the right, although it doesn't really matter

  2:7 => area of shaded to unshaded in Circle A is 2:5
  3:7 => area of shaded to unshaded in Circle B is 3:4

  2:5 => 6:15
  3:4 => 6: 8

  Hence, total unshaded proportion is 15+8 = 23

  Answer is 6:23

   

• syncopation_music

  1 Oct 08, 08:55

  the other question which i still puzzled how to solve it .thanks !

  

• eagle

  1 Oct 08, 09:44

  Area A is 2*2 - 1*1 = 3 cm²

  Area B is 4 * 4 - 3*3 = 7 cm²

  Hence, ratio of Area A to Area B is 3:7

• skythewood

  1 Oct 08, 10:18

  Originally posted by syncopation_music:

  the other question which i still puzzled how to solve it .thanks !

  

  the area of shaded A is te 2nd smallest square minus smallest square

                       shaded B is largest square minus 2nd largest square.