A circle with radius of 1cm sits inside 3cm x 3cm rectangle

The area of the shaded region is 5.86 / cm^{2}

Step-by-step explanation:

The area of the shaded region is equal to the area of the rectangle minus the area of the circle

The rectangle is a square

so

A=b^{2} - / pi r^{2}

we have

b=3 / cm

r=1 / cm

assume

/pi = 3.14

substitute the values

A=3^{2} - (3.14) (1) ^{2}

A=5.86 / cm^{2}