Answer:
Answers below
Explanation:
Answer for 10
6x3=18 --> 18×4=72
6x6=36 --> 36x2=72
72+72=144
144
Answer for 11
18x6=108 --> 108x2=216
20x6=120 --> 120x2=240
20x18=360 --> 360x2=720
216+240+720=1176
1176
Answer for 12
10x7=70 --> 70x2=140
20x7=140 --> 140x2=280
20x10=200 --> 200x2=400
140+280+400=820
820
Answer for 13
16x16=256 --> 256x4=1024
16x20=320 --> 320x2=640
1024+640=1664
1664
Sorry I forgot how to calculate triangles.