Answer:
620
Step-by-step explanation:
triangle1= (8*15)/2=60
triangle2= (8*15)/2=60
rectangle1= 20*17=340
rectangle2= 8*20=160
rectangle3= 15*20= 300
the surface area is the area of each surface added together. so you would add each of those together... which is equal to 920.
I hope this helps!
