How do you add 1/3 plus 4/10

1 / 3 = ( 1 × 10 ) / ( 3 × 10 ) = 10 / 30 ;
4 / 10 = ( 4 × 3 ) / ( 10 × 3 ) = 12 / 30 ;
10 / 30 + 12 / 30 = ( 10 + 12 ) / 30 = 22 / 30 ;
22 / 30 = ( 22 ÷ 2 ) / ( 30 ÷ 2 ) = 11 / 15 ;

Ido not know i use to

You have 2 sides that are 2 cms and you have 6 sides that are 1/2 cm and you have 4 sides that are 1 cm. the smallest sides are 1/2 the medium sized sides are 1 and the smallest are 1/2. so to find the perimeter you have to add them all up together so your answer will be 11 cm's