we have that
the area of the figure is equal to the area of a right triangle plus the area of a semicircle
so
where
Applying Pythagorean Theorem
Find out the base of the triangle
5^2=4^2+b^2
b^2=25-16
b^2=9
b=3 in
h=4 in
r=2 in
substitute given values
A=12 in2
The area is 12 square inches