# ISRO | ISRO CS 2015 | Question 75

Consider the following statements

`#define hypotenuse (a, b) sqrt (a*a+b*b); `

The macro call hypotenuse(a+2,b+3);
(A) Finds the hypotenuse of a triangle with sides a+2 and b+3
(B) Finds the square root of (a+2)2 and (b+3)2
(C) Is invalid
(D) Find the square root of 3*a + 4*b + 5

Explanation:

```A macro is defined with, hypotenuse (a, b) sqrt (a*a+b*b);
call hypotenuse(a+2,b+3);
hypotenuse = sqrt (a+2*a+2 + b+3*b+3)
= sqrt (a + 2a + 2 + b + 3b + 3)
= sqrt (3a + 4b + 5)```

So, option (D) is correct.

Note: correct way to define this macro is:

 `#include ` `#include ` ` `  `//space is not allowed before bracket ` `#define hypotenuse(a, b) sqrt(a*a+b*b) ` `int` `main() ` `{ ` `    ``//assume a = 1, b = 2 ` `    ``printf``(``"%f"``, hypotenuse (1+2, 2+3)); ` `     `  `    ``//output should be 4.000000  ` `    ``return` `0; ` `} `

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