Answer: 21120
Explanation:
Area for the rectangluar prism
A(Rect)= LA+2B
where LA,Lateral area = Ph P,Perimeter of base= 30+120+30+120 = 300
h, height =20
LA=300(20)=6000
B,area of base=(30)(120)=3600
A(rect)=LA+2B=6000+2(3600)
=13200
Area for triangular prism, turn on side so triangle is base(columned)
A(triangle) = LA+2B
LA= Ph Perimeter of triangle = 17+17+30=64 h=120
LA=(64)(120)=7680
B, the base is the triangle=1/2 bh where b =30 h=8
B=1/2 (30)(8)
=120
A(triangle)=7680+2(120) =7920
Add the 2 areas
A(total)=13200+7920=21120