How to solve for the surface area of a triangular prism with a side length of 8.1

A height of 4.0 and a base of 9.0

2 answers

Surface area = 2(base area) + (perimeter of base) x (height)

Surface area = 2(9 x 4.0) + (9 + 8.1 + 8.1) x 4.0

Surface area = 144 + (25.2) x 4.0

Surface area = 144 + 100.8

Surface area = 244.8
AAAaannndd the bot gets it wrong yet again!

2(9 x 4.0) + (9 + 8.1 + 8.1) x 4.0 = 172.8