The answer to 9×7 would be 63
Answer:
see below
Step-by-step explanation:
1 1
--- - --------
n n+1
Get a common denominator
1(n+1) 1(n)
---------- - --------
n(n+1) (n+1)n
n+1 - n
-----------------
n(n+1)
1
-----------------
n(n+1)
Separate into two fractions
1 1
---- * ------
n n+1
We know that :

From the figure, We can notice that :
Ф Adjacent side length = 8
Ф Hypotenuse length = 11



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