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its just a regular rectangular prism

wait ! um... hold

i dont know how to explain

|dw:1436230395747:dw|

|dw:1436230455539:dw|

|dw:1436230548891:dw|

how do i explain

|dw:1436230576483:dw|

i already know it is a rectangle i just dont know how to explain how it is a rectangle

|dw:1436230638043:dw|

oh

|dw:1436230950193:dw|

ok thanks @jim_thompson5910

no problem

what about part b?

the other drawing dan posted shows what you get
|dw:1436231243830:dw|

isnt it a triangle?

no, it's also a rectangle (see the drawing)

ok. i still dont understand why

because a rectangle prism all sides are congruent.

no matter how you cute it. the other side will be the same

imagine you are cutting that big block into 2 pieces
|dw:1436231405243:dw|

The cross section is this shaded portion
|dw:1436231502495:dw|

ok. thx!

sure thing