no 18 tolong bantu jawab sertakan caranya

No. 18
K=(25x2)+(2.½. 22/7.28)+(2.½. 22/7.14)+2.7
=50+88+44+14
=196 m
No. 19
Ltrapesium=(42+42+24+24 /2)50
=3300
L½O=½. 22/7.21.21
=693
L arsir=3300-693=2607