In , then the value of is
Determine the value of .
Step 1; Calculate the value of side .
We know that by Pythagoras theorem for a right-angled triangle:
Step 2: Calculate the value of area and semi-perimeter.
Semi-perimeter of triangle is given by,
Area of triangle
Step 3: Calculate the value of
We know that radius of the outer circle of is given by,
Also, the radius of incircle of is given by
Therefore
Hence, option A is the correct answer.