Question

PLEASE HELP ME ANSWER THIS QUESTION:
-PICTURE IS UNDER THIS POST-

Answer 1

is this triangle or rectangle?

Answer 2

its a triangular pyramid

Answer 3

12) \[t=\frac{1}{2}*pl + B\]
l=12 ( given )
p=12+12+12=36
B= (12*12)/2=72
\[T= \frac{36*12}{2}+36 = 288\]

Answer 4

13) V = B*h
B= 72
h= 11.5 ( given)
V= 11.5* 72= 828

Answer 5

thanx so much!