A cube of side length 8 cm is intersected by a plane perpendicular to the base as shown.

Question

anonymous · Answer

Part 1: Describe the shape of the cross section formed by the cube and the intersecting plane.
Part 2: Find the perimeter of the cross section. Show your work.

anonymous · Answer

attachment

phi · Answer

what shape is it?  
what is its height?

anonymous · Answer

idk

anonymous · Answer

recangle?

anonymous · Answer

rectangle ?

phi · Answer

yes, it's a rectangle, because it has 90 degree angles.  
what is its height?

phi · Answer

looks like the height is the same as the side of the cube.

phi · Answer

you can use pythagoras to find the slanted edge that makes the top and bottom.

anonymous · Answer

idk what that is

phi · Answer

you should know 
a^2 + b^2 = c^2
a, b legs, c the hypotenuse of a right triangle.
very famous, thousands of years old, very important.

phi · Answer

See http://www.khanacademy.org/math/geometry/triangles/v/introduction-to-the-pythagorean-theorem

phi · Answer

But first you have to find the lengths
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