Question
There is a row of two triangular pyramids and one pentagonal pyramid in a display at a museum. How many lateral faces are there altogether?(1 point)
The two triangular pyramids each have 4 lateral faces, as they are triangular pyramids.
The pentagonal pyramid has 5 lateral faces, as it is a pentagonal pyramid.
Therefore, the total number of lateral faces is 4 + 4 + 5 = <<4+4+5=13>>13.
Answer: \boxed{13}.