Please help me provide an explanation too!

Answer:
Step-by-step explanation:
The shaded area is the area of the rectangle minus the area of the two circles.
The circles have a diameter of 10.5cm.
The area of each circle is
A=(pi d^2)/4
So the total area of the two circles is
A=(pi d^2)/2
So the shaded area is
A=10.5(21)-(pi (10.5^2)/2
A=220.5-55.125*pi cm^2
A=47.32 cm^2 (rounded to nearest hundredth of a square centimeter)