$\"\"$

Observe the diagram.

The sum of angles of a angle triangle is $\"\"$ .

$\"\"$

$\"\"$ .

The above traingle is a right triangle.

In a right triangle, the angles are in the ratio $\"\"$ then the sides are in the ratio $\"\"$ .

$\"\"$

One of the side is $\"\"$ .

So sides are $\"\"$ , $\"\"$ and $\"\"$ .

Pythagorean theorem : $\"\"$ .

$\"\"$

Choice (B) $\"\"$ is correct.

$\"\"$

Choice (B) $\"\"$ is correct.