Given a triangle with side lengths of 20 cm and 7 cm, what is a possible length of the third side? A. 13 cm

B. 14 cm

C. 27 cm

D. 28 cm

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14

Step-by-step explanation:

it's either 14 or 13 because there is no way it can be more than 20

a 4/6 = 9/12   not proportional

step-by-step explanation:

to find which are not proportional, we can use cross products

if it is true, they are proportional.   if it is not true, they are not proportional.

a 4/6 = 9/12

4* 12 = 6*9

48 = 54

not this is not proportional  

b 2/3 = 12/18  

2* 18 = 3 * 12

36 = 36

this is proportional

c 5/4 = 10/8  

5*8 = 4*10

40 = 40

this is proportional

d 7/5 = 35/25

7*25 = 5 * 35

175 = 175

is proportional