Cut 2 small circles of a radius of 2cm from a big circle with a radius of 4.5 cm. What is the area of the remaining shaded figure? The answer can be expressed in the form aπ. Find a, in decimal notation.
The large circle has an area of 4.52 × π and the smaller circles have a combined area of 22 × π × 2. Thus the shaded region has an area of
4.52 × π - 22 × π × 2 = 12.25π cm2.