If word 'SQUARE' is coded as 9E7R1A and 'RECTANGLE' is coded as 8E5L3G0N1, then what is word 'QUADRILATERAL' coded as?

QUA = E7R

D = ?
and so on

To determine the coding pattern used for the word 'QUADRILATERAL', let's analyze the given examples:

Word 'SQUARE' is coded as 9E7R1A:
- The first letter 'S' is replaced by the number 9.
- The second letter 'Q' is not present in the coded form.
- The third letter 'U' is replaced by the letter 'E'.
- The fourth letter 'A' is replaced by the number 7.
- The fifth letter 'R' is replaced by the number 1.
- The sixth letter 'E' is replaced by the letter 'A'.

Word 'RECTANGLE' is coded as 8E5L3G0N1:
- The first letter 'R' is replaced by the number 8.
- The second letter 'E' is replaced by the letter 'E'.
- The third letter 'C' is not present in the coded form.
- The fourth letter 'T' is replaced by the letter 'L'.
- The fifth letter 'A' is replaced by the number 5.
- The sixth letter 'N' is replaced by the letter 'G'.
- The seventh letter 'G' is replaced by the number 0.
- The eighth letter 'L' is replaced by the number 1.
- The ninth letter 'E' is not present in the coded form.

From the given examples, it appears that the coding pattern follows a combination of replacing letters with numbers and vice versa. Additionally, some letters from the original word may not be present in the coded form.

Now, let's apply the same coding pattern to the word 'QUADRILATERAL':

- The first letter 'Q' is not present in the coded form.
- The second letter 'U' is replaced by the letter 'E'.
- The third letter 'A' is not present in the coded form.
- The fourth letter 'D' is replaced by the number 7.
- The fifth letter 'R' is replaced by the number 1.
- The sixth letter 'I' is not present in the coded form.
- The seventh letter 'L' is replaced by the number 1.
- The eighth letter 'A' is not present in the coded form.
- The ninth letter 'T' is replaced by the letter 'E'.
- The tenth letter 'E' is not present in the coded form.
- The eleventh letter 'R' is replaced by the number '1'.
- The twelfth letter 'A' is not present in the coded form.
- The thirteenth letter 'L' is replaced by the number '1'.

Therefore, the word 'QUADRILATERAL' can be coded as 'E7R1L1E1'.

To find the code for the word "QUADRILATERAL", we need to analyze the given codes for "SQUARE" and "RECTANGLE".

The code for "SQUARE" is: 9E7R1A
- The first 2 alphabets in the code are the corresponding numbers of the word's length, which is 6 in this case. So, "SQUARE" has two digits "6" and "E" in its code.
- After that, each letter in the word is represented by a single digit or number. For example, 'S' is represented by "7".

The code for "RECTANGLE" is: 8E5L3G0N1
- Following the pattern, the first 2 digits in the code are the corresponding numbers of the word's length, which is 9 in this case. So, "RECTANGLE" has two digits "9" and "E" in its code.
- After that, each letter in the word is represented by a single digit or number. For example, 'R' is represented by "8".

Using this analysis, we can determine the code for "QUADRILATERAL".

The word "QUADRILATERAL" has 13 letters, so the first two digits in the code will be "13".

Now, let's assign a single digit or number to each letter in the word:

Q -> 1
U -> 2
A -> 3
D -> 4
R -> 5
I -> 6
L -> 7
A -> 8
T -> 9
E -> E
R -> 11
A -> 12
L -> 13

So, the code for "QUADRILATERAL" is: 13E1234567811121313