Surface area of any prism is the total area of all its sides and faces.
Points to focus on:
↪There are 2 triangles(equal in area) , 2 rectangles( not equal) & a rectangular base in this triangular prism.
↪Find area of each triangles , base and rectangles & add them up ,to get surface area of the prism.
Area of 2 equal triangles:
A1=2×(1/2)×8×15=120 sq feet
↕
[As area of a right angled=1/2×(b×h) ]
Area of small rectangle:
A2==l×b=8×5=40 sq feet
Area of slanted rectangle:
A3=L×b=17×5=85 sq feet
Area of rectangular base:
A4=15×5=75 sq feet
Finally, the surface area of prism is:
A=A1+A2+A3+A4
=120+40+85+75
=320 sq feet➡ANS
