What is the area of a sector with a central angle of 3π5 radians and a diameter of 21.2 cm? use 3.14 for π and round your final answer to the nearest hundredth. enter your answer as a decimal in the box. cm²

We know that

Area of a circumference=π*r²
for diameter=21.2 cm> r=10.6 cm
A=π*10.6²> A=π*112.36 > A=352.81 cm²

if 2π radians (full circumference) has an area of > 352.81 cm² 
3π/5 radians> X
X=[(3π/5)*(352.81)]/2π> X=105.84 cm²

the answer is 105.84 cm²