A rectangular piece of cardboard measures 16 cm by 13 cm. What is the perimeter of the piece of cardboard?

58cm

Step-by-step explanation:

a rectangle has two of the same sides so 16×2=32

and

13×2=26

so

32+26=58

bru

step-by-step explanation:

geometry: triangles

solvers

lessons

answers archive

call the larger triangle abc

then the smaller triangle cde is similar to abc (all angles are equal, aaa).  

ab is the side that is 36, and we wish to find de, the side corresponding to ab

area_cde = area_abc - area_cde --> area_abc / area_cde = 2

let x=length of de

ratio of areas = (ratio of sides)^2

+2+=+%2836%2fx%29%5e2+

+2+=+1296%2fx%5e2+

++x%5e2+=+1296%2f2+=+648+

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