Can you please help me step-by-step on how you get the permitter and the base please and help me with a question

the base of a triangular prism is a triangle
so
The area of a triangle is
A=(1/2)*(b)*(h)
where
b=24
h=10
so
A=(1/2)*(24)*(10)
Multiply 24*10 then divide by 2
therefore