What is the length of stack A G with bar on top in the rectangular prism? Round to the nearest tenth of a centimeter.

A.
18.0 cm

B.
24.1 cm

C.
28.9 cm

D.
30.2 cm

http://static.k12.com/calms_media/media/1579000_1579500/1579369/1/9a3ad53ce928b8103701d47e4cadf8fd730601e6/MS_IMC-150126-130908.jpg

Question

What is the length of stack A G with bar on top  in the rectangular prism? Round to the nearest tenth of a centimeter.
  

 
 A.
18.0 cm
 
 B.
24.1 cm
 
 C.
28.9 cm
 
 D.
30.2 cm

http://static.k12.com/calms_media/media/1579000_1579500/1579369/1/9a3ad53ce928b8103701d47e4cadf8fd730601e6/MS_IMC-150126-130908.jpg

anonymous · Answer

@freckles

freckles · Answer

ok let's look the triangle in the base rectangle 
notice the hyp of the base triangle is the base length of the triangle we are looking at

freckles · Answer

do you know the Pythagorean theorem?

anonymous · Answer

yes i do now

freckles · Answer

|dw:1430778704850:dw|
let's find h first (by the way this is not the answer we need this in order to get to the answer)

freckles · Answer

|dw:1430778753139:dw|