tolong dijawab ya 11 sama 12

1/2.18.8= 72

Rumus: 1/2.d1.d2

11. Layang-layang
d1xd2/2
18x8/2 = 72
12. L1 = (a+b)/2xt
L1 = (24+40)/2x8
= 64/2x8 = 256

L2= (a+b)/2xt
L2 = (32+40)/2x8
= 36x8 = 288
L1+L2
= 256+288
= 544