tolong di jawab no 11,12

11)L1=22/7×7×7
=154cm2
L2=22/7×14×14×1/2
=616÷2
=308cm2

L total=308+154
=462cm2

12)L1=20×20
=400m2
L2=3,14×10×10×1/2
=314÷2
=157m2
L3=20×8×1/2
=80m2
L arsir=400-(80+157)
=163m2