Done
Hello,
the shaded area can be calculated by:
area of sector - area of right triangle
The angle(ROP) =
Thus the area of the sector is:
The area of the right triangle is
If r is the length of the radius (here r = 4 cm) then the length of the base: and
the length of the height is:
Therefore the shaded area is:
Plug in the values you know to calculate the area.
(For confirmation only: I've got A = 1.017 cm²)