The shaded area in the diagram below shows the cross section of a pyramid intersected by a plane that passes through the apex and is perpendicular to the base. The base of the pyramid is a square of side 16 cm. Each edge of the triangular faces is 24 cm long.

Which is the best approximation of the perimeter of the cross section?

61 cm

40 cm

52 cm

39 cm

Question

The shaded area in the diagram below shows the cross section of a pyramid intersected by a plane that passes through the apex and is perpendicular to the base. The base of the pyramid is a square of side 16 cm.  Each edge of the triangular faces is 24 cm long.  
  
 
  
Which is the best approximation of the perimeter of the cross section?

 61 cm 

 40 cm

 52 cm

 39 cm

anonymous · Answer

http://learn.flvs.net/webdav/assessment_images/educator_geometry_v14/pool_Geom_3641_Seg_Two_Exam_63/image0014e9daea7.jpg

anonymous · Answer

|dw:1345756751751:dw|
find x

anonymous · Answer

and tell me where i got that picture

anonymous · Answer

That's the shaded area?

anonymous · Answer

Where did you get 8 from? Why not 16?

anonymous · Answer

@completeidiot .... is the shadow only half the length of the base on the pyramid? From this veiwpoint I think it's 16....

anonymous · Answer

I am just going to go with 16. But Thanks for showing me the way!!!

anonymous · Answer

sorry that x is the slant on the side of the pyramid

anonymous · Answer

its one of the sides of the shaded area