Answer: The answer is 96
Step-by-step explanation: your have to measure the length by width(6x12) then subtract 12 from 20 which is 8 then divide by 2 and you get 4 so when you have 6x4=24÷2(because its a triangle)=12 since theres 2 triangles multiply by 2 so add 12+12+72 and you get 96