We know that [the area of composite figure]=[area of rectangle]+[area of a half circle]
[area of rectangle]=b*h where b=the base h=the height [area of rectangle]=b*h--------> 4.1*8.6---------> 35.26 cm²
[area of a circle]=pi*r² where r=the radius r=4.1/2-------> 2.05 cm the figure is a half circle then [area of a half circle]=pi*r²/2--------> pi*2.05²/2--------> 6.60 cm²
[the area of composite figure]=35.26+6.60--------> 41.86 cm²
