tolong dijawabya pake caranya yaa

13)L1=phi×r×r
r=20/2=10cm
=3,14×10×10
=314cm2
L2=p×l
=20×25
=500cm2

L total=500+314=814cm2(D)

14)L=phi×r×r
=22/7×21×21
=1386dm2
=1386/1000m
=1,386m2
biaya=1,386×7.500
=Rp10.3950,00(B)