Find the perimeter of .
Step 1: Find the length .
Use Pythagoras' theorem, which states that the square of the
length of a right-angled triangle's hypotenuse is equal to the sum
of the squares of the lengths of the other two sides.
Substitute the known lengths in ,and solve
for the length of .
Step 2: Use Pythagoras' theorem to find the length of
Step 3: Find the perimeter of figure .