PLEASE HELP!! URGENT!!

Question

A triangular prism is 20 millimeters long and has a triangular face with a base of 24 millimeters and a height of 16 millimeters. The other two sides of the triangle are each 20 millimeters. What is the surface area of the triangular prism?

Answer 1

20 mm long

ends=24*16

ends 384sq/mm

triangle sides=a^2+b^2=c^2

12^2+16^2=144+256=400^.5=20mm=c

20length*20width*2=800; 2sides

base=24*20=480

384+800+480=1664sq/mm