How would you describe the slice that created the triangular cross section on this cake asap !

The slicing is done perpendicular to the base.

Step-by-step explanation:

Clearly after looking at the slice which is formed by cutting the rectangular prism we observe that the slicing is done perpendicular to the base such that we obtain the triangular cross section on this cake.

( if it would be done parallel to the base then we would have obtained rectangle ).

Hence, the slicing is done perpendicular to the base.

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