tolong jawab yah ke2 soalnya

12. p=78 cm
l=42 cm
L=p×l
L=78×42
L=3.276 cm²

L ling=1/2×22/7×21×21
L ling=1/2×1386
L ling=693 cm²

L=3.276+693
L=3.969 cm²

13. L=πr²
50,24=3,14×r²
r²=50,24:3,14
r²=16
r=√16
r=4 cm

k=πd
k=3,14×8
k=25,12 cm

semoga membantu

semoga membantu. maaf kalau salah