Question

15. The base of a prism

Answer 1

Answer:

Part a) $SA=458.4\ cm^2$

Part b) Added only one side triangular face instead of three side triangular faces

Step-by-step explanation:

we know that

The surface area of a triangular prism is equal to two times the area of the base plus the area of its three triangular faces

so

$SA=2(73.2)+3(104)$

$SA=146.4+312$

$SA=458.4\ cm^2$

Riley's error was

$SA=2(73.2)+(104)=250.4\ cm^2$

added only one side triangular face instead of three side triangular faces